TestMilestones

	Year of Achievement	Date Dedicated	IEEE Regions	IEEE Section	Dedication #	GeoLoc
16-bit Monolithic DAC, 1981	1981	6 December 2010	5 6	Dallas Tucson	107
16-bit Monolithic DAC, 1981						32° 13' 1.67" N, 110° 52' 40.33" W
20-inch Diameter Photomultiplier Tubes, 1979 - 1987	1979	5 November 2014	10	Nagoya	147
20-inch Diameter Photomultiplier Tubes, 1979 - 1987						34° 48' 51.88" N, 137° 50' 14.15" E
Active Shielding of Superconducting Magnets, 1984-1989	1984	16 June 2022	8	United Kingdom and Ireland	224
Active Shielding of Superconducting Magnets, 1984-1989						51° 46' 40.36" N, 1° 21' 49.91" W
Adams Hydroelectric Generating Plant, 1895	1895	21 June 1990	1	Buffalo	17
Adams Hydroelectric Generating Plant, 1895						43° 4' 54.42" N, 79° 2' 34.61" W
Alexanderson Radio Alternator, 1904	1904	20 February 1992	1	Schenectady	22
Alexanderson Radio Alternator, 1904						42° 48' 35.82" N, 73° 57' 5.58" W
Alouette-ISIS Satellite Program, 1962	1962	1 May 1993	7	Ottawa	23
Alouette-ISIS Satellite Program, 1962						45° 20' 41.75" N, 75° 52' 58.41" W
Alternating-Current Electrification of the New York, New Haven & Hartford Railroad, 1907	1907	22 May 1982	1	Connecticut	3
Alternating-Current Electrification of the New York, New Haven & Hartford Railroad, 1907						41° 1' 48.69" N, 73° 35' 55.82" W
Alternating Current Electrification, 1886	1886	2 October 2004	1	Berkshire	51
Alternating Current Electrification, 1886						42° 11' 54.39" N, 73° 21' 40.35" W
Alvin Deep-Sea Research Submersible, 1965-1984	1964	21 October 2022	1	Providence	230
Alvin Deep-Sea Research Submersible, 1965-1984						41° 31' 30.00" N, 70° 40' 18.12" W
American Standard Code for Information Interchange ASCII, 1963	1963	19 May 2016	1	New Jersey Coast	163
American Standard Code for Information Interchange ASCII, 1963						40° 23' 50.48" N, 74° 8' 15.71" W
Ames Hydroelectric Generating Plant, 1891	1891	1 July 1988	5	Pikes Peak	14
Ames Hydroelectric Generating Plant, 1891						37° 51' 55.80" N, 107° 52' 54.06" W
Amorphous Silicon Thin Film Field-Effect Transistor Switches for Liquid Crystal Displays, 1979	1979	5 April 2018	8	United Kingdom and Ireland	187
Amorphous Silicon Thin Film Field-Effect Transistor Switches for Liquid Crystal Displays, 1979						56° 27' 29.68" N, 2° 58' 55.71" W
Ampex Videotape Recorder, 1956	1956	10 June 2016	6	Santa Clara Valley	165
Ampex Videotape Recorder, 1956						37° 26' 30.78" N, 122° 8' 34.87" W
Apollo 11 Lunar Laser Ranging Experiment (LURE), 1969	1969	1 August 2019	6	Santa Clara Valley	197
Apollo 11 Lunar Laser Ranging Experiment (LURE), 1969						37° 20' 28.82" N, 121° 38' 50.28" W
Apollo Guidance Computer, 1962-1972	1962	13 December 2011	1	Boston	118
Apollo Guidance Computer, 1962-1972						42° 21' 53.43" N, 71° 5' 27.02" W
Atanasoff-Berry Computer, 1939	1939	1 April 1990	4	Central Iowa	18
Atanasoff-Berry Computer, 1939						42° 1' 26.40" N, 93° 38' 21.12" W
Atlas Computer and the Invention of Virtual Memory, 1957-1962	1957	21 June 2022	8	United Kingdom and Ireland	226
Atlas Computer and the Invention of Virtual Memory, 1957-1962						53° 27' 57.78" N, 2° 13' 50.31" W
BASIC Computer Language, 1964	1964	22 February 2021	1	New Hampshire	213
BASIC Computer Language, 1964						43° 42' 9.60" N, 72° 17' 23.44" W
Bell Telephone Laboratories, Inc., 1925-1983	1925	18 December 2014	1	North Jersey	151
Bell Telephone Laboratories, Inc., 1925-1983						40° 41' 3.75" N, 74° 24' 5.86" W
Benjamin Franklin's work in London, 1757-1775	1757	31 March 2003	8	United Kingdom and Ireland	47
Benjamin Franklin's work in London, 1757-1775						51° 30' 26.96" N, 0° 7' 29.64" W
Birth and Growth of Primary and Secondary Battery Industries in Japan, 1893	1893	12 April 2014	10	Kansai	138
Birth and Growth of Primary and Secondary Battery Industries in Japan, 1893#GS Yuasa International Ltd., Kyoto Head Office, Global Technical Head Quarters						34° 58' 39.84" N, 135° 43' 23.98" E
Birth and Growth of Primary and Secondary Battery Industries in Japan, 1893#GS Yuasa International Ltd., Tokyo Head Office						35° 39' 26.65" N, 139° 45' 9.05" E
Birth and Growth of Primary and Secondary Battery Industries in Japan, 1893#Panasonic Corporation, Automotive and Industrial Systems Company Head Office						34° 44' 21.19" N, 135° 34' 21.60" E
Birth and Growth of Primary and Secondary Battery Industries in Japan, 1893#Panasonic Corporation, Energy Device Business Division Head Office						34° 43' 39.51" N, 135° 34' 0.42" E
Birth and Growth of Primary and Secondary Battery Industries in Japan, 1893#Panasonic Corporation, Portable Rechargeable Battery Business Group Head Office						34° 20' 37.73" N, 134° 51' 38.42" E
Birth and Growth of Primary and Secondary Battery Industries in Japan, 1893						34° 58' 51.93" N, 135° 43' 41.00" E
Birthplace of Silicon Valley, 1956	1956	15 August 2018	6	Santa Clara Valley	188
Birthplace of Silicon Valley, 1956						37° 24' 17.55" N, 122° 6' 39.08" W
Birthplace of the Bar Code, 1948	1948	22 October 2012	2	Philadelphia	130
Birthplace of the Bar Code, 1948						39° 57' 17.72" N, 75° 11' 10.83" W
Birthplace of the Internet, 1969	1969	29 October 2009	6	Coastal Los Angeles	96
Birthplace of the Internet, 1969						34° 4' 15.74" N, 118° 26' 28.17" W
Book “Experiments and Observations on Electricity” by Benjamin Franklin, 1751	1751	7 August 2009	2	Philadelphia	87
Book “Experiments and Observations on Electricity” by Benjamin Franklin, 1751#American Philosophical Society Library, Philadelphia, PA.						39° 56' 55.86" N, 75° 8' 51.44" W
Budapest Metroline No.1., 1896	1896	20 October 2022	8	Hungary	229
Budapest Metroline No.1., 1896						47° 29' 53.02" N, 19° 3' 8.32" E
CERN Experimental Instrumentation, 1968	1968	26 September 2005	8	France	63
CERN Experimental Instrumentation, 1968						46° 13' 42.39" N, 6° 4' 19.98" E
Calcutta Electric Supply Corp, 1899	1899	18 December 2021	10	Kolkata	221
Calcutta Electric Supply Corp, 1899						22° 33' 41.81" N, 88° 22' 0.27" E
Callan's Pioneering Contributions to Electrical Science and Technology, 1836	1836	5 September 2006	8	United Kingdom and Ireland	66
Callan's Pioneering Contributions to Electrical Science and Technology, 1836						53° 22' 54.19" N, 6° 35' 25.54" W
Chivilingo Hydroelectric Plant, 1897	1897	24 October 2001	9	Chile	36
Chivilingo Hydroelectric Plant, 1897						37° 5' 25.85" S, 73° 9' 34.83" W
Code-breaking at Bletchley Park during World War II, 1939-1945	1939	1 April 2003	8	United Kingdom and Ireland	49
Code-breaking at Bletchley Park during World War II, 1939-1945						52° 0' 21.08" N, 0° 43' 39.90" W
Commercialization and Industrialization of Photovoltaic Cells, 1959	1959	9 April 2010	10	Kansai	99
Commercialization and Industrialization of Photovoltaic Cells, 1959						34° 28' 32.66" N, 135° 44' 29.43" E
Commercialization of Multilayer Ceramic Capacitors with Nickel Electrodes, 1982	1982	8 March 2024	10	Kansai	248
Commercialization of Multilayer Ceramic Capacitors with Nickel Electrodes, 1982						34° 55' 26.04" N, 135° 42' 6.84" E
Compact Disc Audio Player, 1979	1979	6 March 2009	8	Benelux	83
Compact Disc Audio Player, 1979						51° 24' 54.77" N, 5° 27' 25.61" E
County Kerry Transatlantic Cable Stations, 1866	1866	13 July 2000	8	United Kingdom and Ireland	32
County Kerry Transatlantic Cable Stations, 1866						51° 53' 33.17" N, 10° 23' 21.14" W
Czochralski Process, 1916	1916	14 November 2019	8	Germany Poland	205
Czochralski Process, 1916						52° 59' 29.63" N, 17° 29' 14.56" E
Czochralski Process, 1916						52° 29' 35.65" N, 13° 31' 31.64" E
Czochralski Process, 1916						52° 13' 13.87" N, 21° 0' 37.29" E
DIALOG Online Search System, 1966	1966	23 May 2019	6	Santa Clara Valley	195
DIALOG Online Search System, 1966#Computer History Museum, 1401 N Shoreline Blvd, Mountain View, CA 94043						37° 24' 51.37" N, 122° 4' 38.64" W
DIALOG Online Search System, 1966#Lockheed Martin Advanced Technology Center (formerly Lockheed Palo Alto Research Laboratory, Bldg. 201), 3251 Hanover St., Bldg. 245, Palo Alto, CA 94304-1215						37° 24' 40.36" N, 122° 8' 35.69" W
Dadda's Multiplier, 1965	1965	26 September 2016	8	Italy	170
Dadda's Multiplier, 1965						45° 28' 43.18" N, 9° 13' 57.17" E
Decew Falls Hydro-Electric Plant, 1898	1898	2 May 2004	7	Hamilton	53
Decew Falls Hydro-Electric Plant, 1898						43° 6' 58.81" N, 79° 14' 55.21" W
Deep Space Station 43, 1972-1987	1972	6 March 2024	10	Australian Capital Territory	247
Deep Space Station 43, 1972-1987						35° 24' 9.37" S, 148° 58' 50.26" E
Demonstration of Practical Telegraphy, 1838	1838	7 May 1988	1	North Jersey	13
Demonstration of Practical Telegraphy, 1838						40° 48' 43.20" N, 74° 28' 52.32" W
Demonstration of the ALOHA Packet Radio Data Network, 1971	1971	13 October 2020	6	Hawaii	207
Demonstration of the ALOHA Packet Radio Data Network, 1971						21° 17' 48.52" N, 157° 48' 59.65" W
Detection of Radar Signals Reflected from the Moon, 1946	1946	17 May 2019	1	New Jersey Coast	194
Detection of Radar Signals Reflected from the Moon, 1946						40° 11' 5.50" N, 74° 3' 23.47" W
Development of 193-nm Projection Photolithography, 1984-1996	1984	2 February 2024	1	Boston	245
Development of 193-nm Projection Photolithography, 1984-1996						42° 27' 32.62" N, 71° 16' 1.19" W
Development of CDMA for Cellular Communications, 1989	1989	7 November 2017	6	San Diego	183
Development of CDMA for Cellular Communications, 1989						32° 53' 42.53" N, 117° 11' 51.83" W
Development of Computer Graphics and Visualization Techniques, 1965-1978	1965	24 March 2023	6	Utah	232
Development of Computer Graphics and Visualization Techniques, 1965-1978						40° 46' 7.87" N, 111° 50' 46.00" W
Development of Electronic Television, 1924-1941	1924	12 November 2009	10	Nagoya	85
Development of Electronic Television, 1924-1941						34° 43' 31.15" N, 137° 43' 2.95" E
Development of Ferrite Materials and Their Applications, 1930-1945	1930	13 October 2009	10	Tokyo	88
Development of Ferrite Materials and Their Applications, 1930-1945						35° 36' 24.07" N, 139° 41' 5.24" E
Development of Information Theory, 1939-1967	1939	17 May 2016	1	Boston	162
Development of Information Theory, 1939-1967						42° 21' 42.06" N, 71° 5' 26.02" W
Development of VHS, a World Standard for Home Video Recording, 1976	1976	11 October 2006	10	Tokyo	72
Development of VHS, a World Standard for Home Video Recording, 1976						35° 13' 28.26" N, 139° 42' 21.87" E
Development of the HP-35, the First Handheld Scientific Calculator, 1972	1972	14 April 2009	6	Santa Clara Valley	82
Development of the HP-35, the First Handheld Scientific Calculator, 1972						37° 24' 42.48" N, 122° 8' 52.08" W
Directive Short Wave Antenna, 1924	1924	17 June 1995	10	Sendai	26
Directive Short Wave Antenna, 1924						38° 16' 17.86" N, 140° 51' 32.82" E
Discovery of Radioconduction by Edouard Branly, 1890	1890	23 September 2010	8	France	102
Discovery of Radioconduction by Edouard Branly, 1890						48° 50' 56.46" N, 2° 19' 46.85" E
Discovery of Superconductivity, 1911	1911	8 April 2011	8	Benelux	112
Discovery of Superconductivity, 1911						52° 9' 21.82" N, 4° 29' 25.79" E
Early Developments in Remote-Control, 1901	1901	15 March 2007	8	Spain	73
Early Developments in Remote-Control, 1901						40° 26' 48.59" N, 3° 43' 53.67" W
Eel River High Voltage Direct Current Converter Station, 1972	1972	24 February 2011	7	New Brunswick	109
Eel River High Voltage Direct Current Converter Station, 1972						48° 0' 37.81" N, 66° 22' 26.40" W
Electric Fire Alarm System, 1852	1852	1 October 2004	1	Boston	50
Electric Fire Alarm System, 1852						42° 20' 38.28" N, 71° 5' 27.19" W
Electric Lighting Of The Kingdom of Hawaii 1886-1888	1886	23 March 2018	6	Hawaii	186
Electric Lighting Of The Kingdom of Hawaii 1886-1888						21° 18' 24.12" N, 157° 51' 32.04" W
Electronic Numerical Integrator and Computer, 1946	1946	1 September 1987	2	Philadelphia	12
Electronic Numerical Integrator and Computer, 1946						39° 57' 10.12" N, 75° 11' 24.17" W
Electronic Quartz Wristwatch, 1969	1969	25 November 2004	10	Tokyo	56
Electronic Quartz Wristwatch, 1969						35° 42' 47.96" N, 139° 48' 33.35" E
Electronic Technology for Space Rocket Launches, 1950-1969	1950	1 February 2001	3	Canaveral	42
Electronic Technology for Space Rocket Launches, 1950-1969						28° 31' 23.93" N, 80° 40' 55.42" W
Emergency Warning Code Signal Broadcasting System, 1985	1985	11 May 2016	10	Tokyo	161
Emergency Warning Code Signal Broadcasting System, 1985						35° 38' 8.33" N, 139° 36' 56.60" E
Enrico Fermi's Major Contribution to Semiconductor Statistics, 1924-1926	1924	5 December 2015	8	Italy	159
Experimental Breeder Reactor I, 1951	1951	4 June 2004	6	Eastern Idaho	55
Experimental Breeder Reactor I, 1951						43° 31' 57.88" N, 112° 56' 34.08" W
FM Police Radio Communication, 1940	1940	1 June 1987	1	Connecticut	11
FM Police Radio Communication, 1940						41° 45' 34.60" N, 72° 40' 54.86" W
Fiber Optic Connectors, 1986	1986	5 March 2021	10	Tokyo	214
Fiber Optic Connectors, 1986						36° 7' 42.19" N, 140° 5' 22.08" E
First 500 MeV Proton Beam from the TRIUMF Cyclotron, 1974	1974	16 December 2010	7	Vancouver	108
First 500 MeV Proton Beam from the TRIUMF Cyclotron, 1974						49° 14' 52.10" N, 123° 13' 46.44" W
First 735 kV AC Transmission System, 1965	1965	1 November 2005	7	Quebec	62
First 735 kV AC Transmission System, 1965						45° 30' 29.14" N, 73° 33' 44.48" W
First Atomic Clock, 1948	1948	8 August 2017	2	Washington	180
First Atomic Clock, 1948						38° 56' 31.66" N, 77° 3' 45.04" W
First Blind Takeoff, Flight and Landing, 1929	1929	24 September 2014	1	Long Island	145
First Blind Takeoff, Flight and Landing, 1929						40° 43' 41.08" N, 73° 35' 50.60" W
First Breaking of Enigma Code by the Team of Polish Cipher Bureau, 1932-1939	1932	5 August 2014	8	Poland	142
First Breaking of Enigma Code by the Team of Polish Cipher Bureau, 1932-1939						52° 13' 16.96" N, 21° 0' 52.75" E
First Central Station in South Carolina, 1882	1882	24 July 1986	3	Coastal South Carolina	8
First Central Station in South Carolina, 1882						32° 46' 39.76" N, 79° 56' 0.25" W
First Computerized Tomography (CT) X-ray Scanner, 1971	1971	26 October 2022	8	United Kingdom and Ireland	231
First Computerized Tomography (CT) X-ray Scanner, 1971						51° 30' 20.02" N, 0° 25' 35.72" W
First Demonstration of a Fibre Bragg Grating, 1978	1978	11 August 2023	7	Ottawa	235
First Demonstration of a Fibre Bragg Grating, 1978						45° 20' 42.71" N, 75° 52' 49.57" W
First Digitally Processed Image from a Spaceborne Synthetic Aperture Radar, 1978	1978	9 September 2014	7	Vancouver	144
First Digitally Processed Image from a Spaceborne Synthetic Aperture Radar, 1978						49° 10' 31.33" N, 123° 4' 13.51" W
First Direct Broadcast Satellite Service, 1984	1984	18 November 2011	10	Tokyo	116
First Direct Broadcast Satellite Service, 1984						35° 38' 14.20" N, 139° 36' 30.76" E
First Distant Speech Transmission in Canada, 1876	1876	4 May 2008	7	Hamilton	75
First Distant Speech Transmission in Canada, 1876						43° 11' 37.83" N, 80° 23' 2.86" W
First Exploration and Proof of Liquid Crystals, 1889	1889	11 October 2017	8	Germany	182
First Exploration and Proof of Liquid Crystals, 1889						49° 0' 34.25" N, 8° 24' 44.39" E
First External Cardiac Pacemaker, 1950	1950	1 September 2009	7	Toronto	95
First External Cardiac Pacemaker, 1950						43° 39' 37.44" N, 79° 23' 21.94" W
First Generation and Experimental Proof of Electromagnetic Waves, 1886-1888	1886	5 December 2014	8	Germany	150
First Generation and Experimental Proof of Electromagnetic Waves, 1886-1888						49° 0' 34.25" N, 8° 24' 44.39" E
First Geographic Information System (GIS), 1962-1968	1962	11 August 2023	7	Ottawa	236
First Geographic Information System (GIS), 1962-1968						45° 26' 32.00" N, 75° 41' 43.00" W
First Intelligible Voice Transmission over Electric Wire, 1876	1876	10 March 2006	1	Boston	67
First Intelligible Voice Transmission over Electric Wire, 1876						42° 21' 33.76" N, 71° 3' 28.95" W
First Large-Scale Fingerprint ID, 1982	1982	15 December 2020	10	Tokyo	210
First Large-Scale Fingerprint ID, 1982						35° 38' 57.96" N, 139° 44' 53.00" E
First Millimeter-wave Communication Experiments by J.C. Bose, 1894-96	1894	15 September 2012	10	Kolkata	128
First Millimeter-wave Communication Experiments by J.C. Bose, 1894-96						22° 34' 31.83" N, 88° 21' 48.65" E
First Operational Use Of Wireless Telegraphy, 1899-1902	1899	29 September 1999	8	South Africa	29
First Operational Use Of Wireless Telegraphy, 1899-1902						33° 58' 44.44" S, 18° 28' 56.28" E
First Optical Fiber Laser and Amplifier, 1961-1964	1961	26 October 2012	1	Worcester County	131
First Optical Fiber Laser and Amplifier, 1961-1964						42° 4' 30.08" N, 72° 1' 36.36" W
First Practical Field Emission Electron Microscope, 1972	1972	31 January 2012	10	Tokyo	119
First Practical Field Emission Electron Microscope, 1972						35° 42' 42.36" N, 139° 28' 12.31" E
First Public Demonstration of Television, 1926	1926	26 January 2017	8	United Kingdom and Ireland	171
First Public Demonstration of Television, 1926						51° 30' 48.32" N, 0° 7' 52.34" W
First RISC (Reduced Instruction-Set Computing) Microprocessor 1980-1982	1980	12 February 2015	6	Oakland-East Bay	152
First RISC (Reduced Instruction-Set Computing) Microprocessor 1980-1982						37° 52' 32.25" N, 122° 15' 31.98" W
First Radio Astronomical Observations Using Very Long Baseline Interferometry, 1967	1967	25 September 2010	7	Vancouver	106
First Radio Astronomical Observations Using Very Long Baseline Interferometry, 1967						49° 19' 15.18" N, 119° 37' 13.31" W
First Real-Time Speech Communication on Packet Networks, 1974 - 1982	1974	8 December 2011	1	Boston	117
First Real-Time Speech Communication on Packet Networks, 1974 - 1982						42° 27' 31.05" N, 71° 15' 48.84" W
First Robotic Control from Human Brain Signals, 1988	1988	10 October 2023	8	North Macedonia	239
First Robotic Control from Human Brain Signals, 1988						42° 0' 17.60" N, 21° 24' 30.00" E
First Semiconductor Integrated Circuit (IC), 1958	1958	15 October 2009	5	Dallas	90
First Semiconductor Integrated Circuit (IC), 1958						32° 55' 29.82" N, 96° 45' 23.89" W
First Studies on Ring Armature for Direct-Current Dynamos, 1860-1863	1860	4 December 2018	8	Italy	192
First Studies on Ring Armature for Direct-Current Dynamos, 1860-1863						43° 43' 15.56" N, 10° 23' 23.24" E
First Technical Meeting of the American Institute of Electrical Engineers, 1884	1884	15 December 2013	2	Philadelphia	136
First Technical Meeting of the American Institute of Electrical Engineers, 1884						39° 57' 29.30" N, 75° 10' 21.45" W
First Television Broadcast in Western Canada, 1953	1953	6 November 2010	7	Vancouver	104
First Television Broadcast in Western Canada, 1953#CBC Broadcasting Site, Vancouver, Canada						49° 21' 13.00" N, 122° 57' 24.00" W
First Television Broadcast in Western Canada, 1953						49° 21' 49.00" N, 122° 57' 24.00" W
First Transatlantic Reception of a Television Signal via Satellite, 1962	1962	1 July 2002	8	France	44
First Transatlantic Reception of a Television Signal via Satellite, 1962						48° 46' 26.13" N, 3° 31' 2.01" W
First Transatlantic Television Signal via Satellite, 1962	1962	1 July 2002	8	United Kingdom and Ireland	44
First Transatlantic Television Signal via Satellite, 1962						50° 3' 24.04" N, 5° 11' 7.40" W
First Transatlantic Transmission of a Television Signal via Satellite, 1962	1962	1 July 2002	1	Maine	44
First Transatlantic Transmission of a Television Signal via Satellite, 1962						44° 56' 19.50" N, 70° 45' 0.18" W
First Transpacific Reception of a Television (TV) Signal via Satellite, 1963	1963	23 November 2009	10	Tokyo	92
First Transpacific Reception of a Television (TV) Signal via Satellite, 1963						36° 41' 50.54" N, 140° 42' 32.23" E
First Wearable Cardiac Pacemaker, 1957-1958	1957	1 October 1999	4	Twin Cities	31
First Wearable Cardiac Pacemaker, 1957-1958						44° 56' 19.50" N, 93° 19' 17.77" W
First Wireless Radio Broadcast by Reginald A. Fessenden, 1906	1906	13 September 2008	1	Boston	78
First Wireless Radio Broadcast by Reginald A. Fessenden, 1906						42° 4' 55.10" N, 70° 38' 27.42" W
First Working Laser, 1960	1960	23 November 2010	6	Metropolitan Los Angeles	105
First Working Laser, 1960						34° 2' 36.25" N, 118° 41' 45.66" W
Fleming Valve, 1904	1904	1 July 2004	8	United Kingdom and Ireland	54
Fleming Valve, 1904						51° 31' 22.92" N, 0° 7' 53.79" W
Folsom Powerhouse, 1895	1895	13 July 2021	6	Sacramento Valley	218
Folsom Powerhouse, 1895						38° 33' 51.13" N, 121° 44' 11.88" W
French Transatlantic Telegraph Cable of 1898	1898	6 September 2018	1 8	France Providence	191
French Transatlantic Telegraph Cable of 1898						41° 47' 16.21" N, 69° 59' 14.98" W
Gapless Metal Oxide Surge Arrester (MOSA) for electric power systems,1975	1975	18 August 2014	10	Tokyo	143
Gapless Metal Oxide Surge Arrester (MOSA) for electric power systems,1975						35° 38' 16.49" N, 139° 42' 54.77" E
Georgetown Steam Hydro Generating Plant, 1900	1900	31 July 1999	5	Denver	28
Georgetown Steam Hydro Generating Plant, 1900						39° 42' 23.47" N, 105° 41' 52.51" W
Germany’s First Broadcast Transmission from the Radio Station Königs Wusterhausen, 1920	1920	16 July 2016	8	Germany	167
Germany’s First Broadcast Transmission from the Radio Station Königs Wusterhausen, 1920						52° 18' 15.64" N, 13° 37' 14.57" E
Giant Metrewave Radio Telescope, 1994	1994	30 March 2021	10	Pune	216
Giant Metrewave Radio Telescope, 1994						19° 5' 48.17" N, 74° 2' 59.84" E
Gotland High Voltage Direct Current Link, 1954	1954	15 May 2017	8	Sweden	176
Gotland High Voltage Direct Current Link, 1954						57° 35' 15.78" N, 18° 11' 40.61" E
Grand Central Terminal Electrification, 1906-1913	1906	15 June 2016	1	New York	166
Grand Central Terminal Electrification, 1906-1913						40° 45' 9.81" N, 73° 58' 38.03" W
Gravitational-Wave Antenna, 1972-1989	1972	3 February 2021	5 6 8	Baton Rouge Italy Richland	212
Gravitational-Wave Antenna, 1972-1989						46° 27' 18.57" N, 119° 24' 34.88" W
Gravitational-Wave Antenna, 1972-1989						43° 37' 52.40" N, 10° 30' 14.48" E
Gravitational-Wave Antenna, 1972-1989						30° 33' 47.48" N, 90° 46' 27.19" W
Grumman Lunar Module, 1962-1972	1962	20 July 2011	1	Long Island	115
Grumman Lunar Module, 1962-1972						40° 45' 5.79" N, 73° 30' 6.64" W
HEMT, 1979	1979	18 December 2019	10	Tokyo	206
HEMT, 1979						35° 26' 36.26" N, 139° 18' 50.12" E
Handheld Digital Camera, 1975	1975	26 April 2022	1	Rochester	223
Handheld Digital Camera, 1975						43° 11' 53.94" N, 77° 37' 51.23" W
Harvard Mark 1 Computer, 1944 - 1959						42° 22' 34.84" N, 71° 6' 59.78" W
High-Temperature Superconductivity, 1987	1987	17 November 2014	5	Houston	149
High-Temperature Superconductivity, 1987						29° 43' 23.47" N, 95° 20' 47.17" W
Human Rescue Enabled by Space Technology, 1982	1982	9 September 2019	7	Ottawa	200
Human Rescue Enabled by Space Technology, 1982						45° 27' 30.75" N, 75° 38' 46.56" W
IBM Thomas J. Watson Research Center, 1960 - 1984	1960	16 October 2009	1	New York	91
IBM Thomas J. Watson Research Center, 1960 - 1984						41° 12' 58.29" N, 73° 48' 21.61" W
IEEE Special Citation Computer History Museum, 1979	1979	29 October 2015	6	Santa Clara Valley	2
IEEE Standard 754 for Binary Floating-Point Arithmetic, 1985	1985	3 May 2023	6	Oakland-East Bay	234
IEEE Standard 754 for Binary Floating-Point Arithmetic, 1985						37° 52' 32.25" N, 122° 15' 31.98" W
Inception of the ARPANET, 1969	1969	16 September 2009	6	Santa Clara Valley	97
Inception of the ARPANET, 1969						37° 27' 33.25" N, 122° 10' 26.94" W
Interactive Video Games, 1966	1966	21 September 2015	1	New Hampshire	158
Interactive Video Games, 1966						42° 45' 50.68" N, 71° 27' 29.36" W
International Standardization of G3 Facsimile, 1980	1980	5 April 2012	10	Tokyo	120
International Standardization of G3 Facsimile, 1980#KDDI R&D Laboratories Inc., Kamifukuoka-city, Saitama Japan						35° 51' 42.22" N, 139° 38' 43.74" E
International Standardization of G3 Facsimile, 1980						35° 16' 52.83" N, 139° 40' 19.92" E
Introduction of the Apple II Computer: 1977-1978						37° 19' 54.10" N, 122° 1' 48.79" W
Invention of Holography, 1947	1947	12 June 2013	8	United Kingdom and Ireland	133
Invention of Holography, 1947						51° 29' 55.56" N, 0° 10' 28.28" W
Invention of Public-key Cryptography, 1969 - 1975	1969	5 October 2010	8	United Kingdom and Ireland	103
Invention of Public-key Cryptography, 1969 - 1975						51° 54' 4.41" N, 2° 4' 40.50" W
Invention of Sonar, 1915-1918	1915	7 December 2023	8	France	242
Invention of Sonar, 1915-1918						48° 50' 28.58" N, 2° 20' 42.05" E
Invention of Stereo Sound Reproduction, 1931	1931	1 April 2015	8	United Kingdom and Ireland	154
Invention of Stereo Sound Reproduction, 1931						51° 31' 55.72" N, 0° 10' 40.51" W
Invention of a Temperature-Insensitive Quartz Oscillation Plate, 1933	1933	6 March 2017	10	Tokyo	174
Invention of a Temperature-Insensitive Quartz Oscillation Plate, 1933						35° 36' 24.75" N, 139° 41' 5.29" E
Invention of the First Transistor at Bell Telephone Laboratories, Inc., 1947	1947	8 December 2009	1	North Jersey	89
Invention of the First Transistor at Bell Telephone Laboratories, Inc., 1947						40° 41' 2.95" N, 74° 24' 4.23" W
Inverter-Driven Air Conditioner, 1980-1981	1980	16 March 2021	10	Nagoya	215
Inverter-Driven Air Conditioner, 1980-1981						35° 8' 52.45" N, 138° 39' 53.06" E
Keage Power Station: The Japan’s First Commercial Hydroelectric Plant, 1890-1897	1890	11 September 2016	10	Kansai	168
Keage Power Station: The Japan’s First Commercial Hydroelectric Plant, 1890-1897						35° 0' 36.72" N, 135° 47' 18.50" E
Krka-Šibenik Electric Power System, 1895	1895	5 July 2013	8	Croatia	134
Krka-Šibenik Electric Power System, 1895						43° 48' 16.92" N, 15° 57' 47.88" E
Kurobe River No. 4 Hydropower Plant, 1956-63	1956	9 April 2010	10	Kansai	98
Kurobe River No. 4 Hydropower Plant, 1956-63						36° 33' 59.18" N, 137° 39' 43.67" E
Landing of the Transatlantic Cable, 1866	1866	15 June 1985	7	Newfoundland-Labrador	5
Landing of the Transatlantic Cable, 1866						47° 52' 14.33" N, 53° 21' 53.59" W
Largest Private (dc) Generating Plant in the U.S.A., 1929	1929	25 September 2008	1	New York	79
Largest Private (dc) Generating Plant in the U.S.A., 1929						40° 45' 7.89" N, 73° 59' 36.47" W
Lempel-Ziv Data Compression Algorithm, 1977	1977	1 September 2004	8	Israel	57
Lempel-Ziv Data Compression Algorithm, 1977						32° 48' 0.16" N, 34° 59' 59.83" E
Line Spectrum Pair (LSP) for high-compression speech coding, 1975	1975	22 May 2014	10	Tokyo	140
Line Spectrum Pair (LSP) for high-compression speech coding, 1975						35° 43' 12.54" N, 139° 33' 43.69" E
Liquid Crystal Display, 1968	1968	30 September 2006	1	Princeton/Central Jersey	71
Liquid Crystal Display, 1968						40° 19' 54.07" N, 74° 37' 53.89" W
Long-Range Shortwave Voice Transmissions from Byrd's Antarctic Expedition, 1934	1934	1 February 2001	4	Cedar Rapids	38
Long-Range Shortwave Voice Transmissions from Byrd's Antarctic Expedition, 1934						42° 1' 42.01" N, 91° 38' 19.27" W
Loran, 1940 - 1946	1940	27 June 2012	1	Boston	123
Loran, 1940 - 1946						42° 21' 42.06" N, 71° 5' 26.02" W
MIT Radiation Laboratory, 1940-1945	1940	1 October 1990	1	Boston	19
MIT Radiation Laboratory, 1940-1945						42° 22' 28.09" N, 71° 6' 20.73" W
MPD7720DSP, 1980	1980	15 December 2020	10	Tokyo	209
MPD7720DSP, 1980						35° 34' 21.16" N, 139° 39' 54.56" E
MPEG Multimedia Integrated Circuits, 1984-1993	1984	28 September 2023	8	France	237
MPEG Multimedia Integrated Circuits, 1984-1993						45° 12' 12.00" N, 5° 41' 45.00" E
MTI Portable Satellite Communication Terminals, 1987-1995	1987	6 December 2023	10	Taipei	241
MTI Portable Satellite Communication Terminals, 1987-1995						24° 46' 50.23" N, 120° 59' 47.98" E
Mainline Electrification of the Baltimore and Ohio Railroad, 1895	1895	21 June 2012	2	Baltimore	122
Mainline Electrification of the Baltimore and Ohio Railroad, 1895						39° 17' 7.44" N, 76° 38' 5.30" W
Manchester University "Baby" Computer and its Derivatives, 1948-1951	1948	21 June 2022	8	United Kingdom and Ireland	225
Manchester University "Baby" Computer and its Derivatives, 1948-1951						53° 27' 59.27" N, 2° 14' 5.36" W
Manufacture of Transistors, 1951	1951	1 April 1989	2	Lehigh Valley	15
Manufacture of Transistors, 1951						40° 37' 22.05" N, 75° 27' 3.73" W
Map-Based Automotive Navigation System, 1981	1981	2 March 2017	10	Tokyo	173
Map-Based Automotive Navigation System, 1981						36° 31' 36.57" N, 140° 13' 36.17" E
Marconi's Early Experiments in Wireless Telegraphy, 1895	1895	29 April 2011	8	Italy	113
Marconi's Early Experiments in Wireless Telegraphy, 1895						44° 25' 52.67" N, 11° 16' 1.88" E
Maxwell's Equations, 1860-1871	1860	13 August 2009	8	United Kingdom and Ireland	86
Maxwell's Equations, 1860-1871#Castle Douglas, Kirkcudbrightshire, Scotland						55° 1' 57.00" N, 3° 56' 43.05" W
Maxwell's Equations, 1860-1871						51° 30' 43.24" N, 0° 6' 59.84" W
Mercury Spacecraft MA-6, 1962	1962	24 February 2011	5	Saint Louis	110
Mercury Spacecraft MA-6, 1962						38° 44' 58.98" N, 90° 20' 50.06" W
Merrill Wheel-Balancing System, 1945	1945	1 September 1999	5	Denver	30
Merrill Wheel-Balancing System, 1945						39° 44' 29.99" N, 105° 5' 1.40" W
Mill Creek No. 1 Hydroelectric Plant, 1893	1893	20 February 1977	6	Foothill	2
Mill Creek No. 1 Hydroelectric Plant, 1893						34° 5' 16.36" N, 117° 2' 22.20" W
Mode S Air Traffic Control Radar Beacon System, 1969-1995	1969	2 February 2024	1	Boston	244
Mode S Air Traffic Control Radar Beacon System, 1969-1995						42° 27' 32.62" N, 71° 16' 1.19" W
Monochrome-Compatible Electronic Color Television, 1946-1953	1946	29 November 2001	1	Princeton/Central Jersey	40
Monochrome-Compatible Electronic Color Television, 1946-1953						40° 19' 54.07" N, 74° 37' 53.89" W
Moore's Law, 1965	1965	15 August 2018	6	Santa Clara Valley	189
Moore's Law, 1965						37° 24' 11.86" N, 122° 6' 40.13" W
Mount Fuji Radar System, 1964	1964	6 March 2000	10	Tokyo	34
Mount Fuji Radar System, 1964						35° 41' 12.74" N, 139° 45' 22.91" E
Multiple Technologies on a Chip, 1985	1985	18 May 2021	8	Italy	217
Multiple Technologies on a Chip, 1985						45° 34' 15.84" N, 9° 21' 47.08" E
NAIC/Arecibo Radiotelescope, 1963	1963	1 November 2001	9	Puerto Rico & Caribbean	41
NAIC/Arecibo Radiotelescope, 1963						18° 20' 39.93" N, 66° 45' 11.32" W
Nelson River HVDC Transmission System, 1972	1972	3 June 2005	7	Winnipeg	64
Nelson River HVDC Transmission System, 1972						54° 13' 6.34" N, 97° 36' 47.15" W
Nikola Tesla (1856-1943), Electrical Pioneer (Special Citation)	1856	1 October 2006	8	Serbia and Montenegro	1
Nikola Tesla (1856-1943), Electrical Pioneer (Special Citation)						44° 48' 59.50" N, 20° 27' 49.28" E
Nobeyama 45-m Telescope, 1982	1982	14 June 2017	10	Tokyo	178
Nobeyama 45-m Telescope, 1982						35° 40' 30.72" N, 139° 32' 16.44" E
Object-Oriented Programming, 1961-1967	1961	27 September 2017	8	Norway	181
Object-Oriented Programming, 1961-1967						59° 56' 37.03" N, 10° 43' 5.98" E
One-Way Police Radio Communication, 1928	1928	1 May 1987	4	Southeastern Michigan	9
One-Way Police Radio Communication, 1928						42° 20' 8.52" N, 83° 2' 34.81" W
Opana Radar Site, 1941	1941	1 February 2000	6	Hawaii	33
Opana Radar Site, 1941						21° 42' 15.54" N, 157° 59' 54.49" W
Outdoor large-scale color display system, 1980	1980	7 March 2018	10	Fukuoka	185
Outdoor large-scale color display system, 1980						32° 45' 44.62" N, 129° 51' 53.39" E
Panama Canal Electrical and Control Installations, 1914	1914	4 April 2003	9	Panama	48
Panama Canal Electrical and Control Installations, 1914						8° 56' 3.31" N, 79° 33' 55.41" W
Parkes Radiotelescope, 1969	1969	11 October 2019	10	New South Wales	202
Parkes Radiotelescope, 1969						32° 59' 54.25" S, 148° 15' 48.56" E
Pearl Street Station, 1882	1882	10 May 2011	1	New York	114
Pearl Street Station, 1882						40° 44' 2.89" N, 73° 59' 19.09" W
Perpendicular Magnetic Recording, 1977	1977	9 October 2023	10	Sendai	238
Perpendicular Magnetic Recording, 1977						38° 15' 12.45" N, 140° 52' 24.08" E
Piezoelectric Oscillator, 1921-1923	1921	5 November 2020	1	Connecticut	208
Piezoelectric Oscillator, 1921-1923						41° 33' 12.12" N, 71° 39' 27.36" W
Pinawa Hydroelectric Power Project, 1906	1906	6 June 2008	7	Winnipeg	77
Pinawa Hydroelectric Power Project, 1906						49° 51' 20.91" N, 97° 9' 15.17" W
Pioneering Work on Electronic Calculators, 1964-1973	1964	1 December 2005	10	Kansai	65
Pioneering Work on Electronic Calculators, 1964-1973						34° 36' 10.71" N, 135° 51' 32.31" E
Pioneering Work on the Quartz Electronic Wristwatch, 1962-1967	1962	28 September 2002	8	Switzerland	45
Pioneering Work on the Quartz Electronic Wristwatch, 1962-1967						46° 59' 59.46" N, 6° 57' 12.20" E
Polymer Self-Regulating Heat-Tracing Cable, 1972	1972	28 August 2019	6	Santa Clara Valley	199
Polymer Self-Regulating Heat-Tracing Cable, 1972						37° 29' 5.74" N, 122° 12' 38.35" W
Popov's Contribution to the Development of Wireless Communication, 1895	1895	20 May 2005	8	Russia (Northwest)	58
Popov's Contribution to the Development of Wireless Communication, 1895						59° 56' 36.14" N, 30° 22' 42.86" E
Poulsen-Arc Radio Transmitter, 1902	1902	1 May 1994	8	Denmark	24
Poulsen-Arc Radio Transmitter, 1902						55° 40' 34.63" N, 12° 34' 9.41" E
Power System of Boston's Rapid Transit, 1889	1889	10 November 2004	1	Boston	52
Power System of Boston's Rapid Transit, 1889						42° 21' 23.32" N, 71° 3' 45.03" W
Public Demonstration of Online Systems and Personal Computing, 1968	1968	19 March 2017	6	Santa Clara Valley	175
Public Demonstration of Online Systems and Personal Computing, 1968						37° 27' 27.38" N, 122° 10' 35.90" W
QR (Quick Response) Code, 1994	1994	26 September 2022	10	Nagoya	228
QR (Quick Response) Code, 1994						34° 59' 43.92" N, 137° 0' 32.36" E
RAMAC, 1956	1956	26 May 2005	6	Santa Clara Valley	60
RAMAC, 1956						37° 21' 9.82" N, 121° 56' 17.44" W
RCA Central, 1921	1921	5 November 2021	1	Long Island	219
RCA Central, 1921						40° 53' 48.05" N, 72° 56' 43.55" W
Radar Predecessor, 1904	1904	19 October 2019	8	Germany	203
Radar Predecessor, 1904						50° 56' 27.60" N, 6° 57' 46.00" E
Railroad Ticketing Examining System, 1965-1971	1965	27 November 2007	10	Kansai	74
Railroad Ticketing Examining System, 1965-1971						34° 41' 59.21" N, 135° 28' 10.49" E
Raman Effect, 1928	1928	15 September 2012	10	Kolkata	129
Raman Effect, 1928						22° 29' 56.00" N, 88° 22' 7.20" E
Rationalization of Units, 1901-1902	1901	15 December 2021	8	Italy	220
Rationalization of Units, 1901-1902						41° 53' 21.07" N, 12° 29' 53.73" E
Reception of Transatlantic Radio Signals, 1901	1901	4 October 1985	7	Newfoundland-Labrador	6
Reception of Transatlantic Radio Signals, 1901						47° 34' 18.66" N, 52° 41' 20.99" W
Revoked					46
Rheinfelden Hydroelectric Power Plant, 1898 - 2010	1898	25 September 2014	8	Germany	146
Rheinfelden Hydroelectric Power Plant, 1898 - 2010						47° 33' 58.09" N, 7° 48' 6.64" E
Richmond Union Passenger Railway, 1888	1888	2 February 1992	3	Richmond	21
Richmond Union Passenger Railway, 1888						37° 32' 55.37" N, 77° 25' 57.92" W
Rincón del Bonete, 1945	1945	14 December 2012	9	Uruguay	132
Rincón del Bonete, 1945						32° 50' 0.65" S, 56° 25' 23.54" W
Rotating Fields and Early Induction Motors, 1885-1888	1885	21 January 2021	8	Italy	211
Rotating Fields and Early Induction Motors, 1885-1888						45° 4' 3.61" N, 7° 39' 22.95" E
SCR/Thyristor, 1957	1957	14 June 2019	1	Rochester	196
SCR/Thyristor, 1957						43° 5' 3.55" N, 76° 52' 33.08" W
SHAKEY: The World’s First Mobile Intelligent Robot, 1972	1972	16 February 2017	6	Santa Clara Valley	172
SHAKEY: The World’s First Mobile Intelligent Robot, 1972						37° 27' 17.34" N, 122° 10' 19.32" W
SPARC RISC Architecture, 1987	1987	13 February 2015	6	Santa Clara Valley	153
SPARC RISC Architecture, 1987						37° 23' 32.98" N, 121° 57' 21.64" W
SPICE (Simulation Program with Integrated Circuit Emphasis), 1969-1970	1971	20 February 2011	6	Santa Clara Valley Oakland-East Bay	111
SPICE (Simulation Program with Integrated Circuit Emphasis), 1969-1970						37° 52' 31.24" N, 122° 15' 28.71" W
Salvá's Electric Telegraph, 1804	1804	17 May 2019	8	Spain	193
Salvá's Electric Telegraph, 1804						41° 23' 3.01" N, 2° 10' 14.52" E
Semi-Automatic Ground Environment (SAGE) 1951-1958	1951	27 June 2012	1	Boston	125
Semi-Automatic Ground Environment (SAGE) 1951-1958						42° 27' 31.05" N, 71° 15' 48.84" W
Semiconductor Laser, 1962	1962	2 February 2024	1	Schenectady New York Boston	246
Semiconductor Laser, 1962						42° 49' 52.32" N, 73° 52' 46.92" W
Semiconductor Planar Process and Integrated Circuit, 1959	1959	8 May 2009	6	Santa Clara Valley	93
Semiconductor Planar Process and Integrated Circuit, 1959						37° 25' 24.59" N, 122° 6' 15.57" W
Shannon Scheme for the Electrification of the Irish Free State, 1929	1929	29 July 2002	8	United Kingdom and Ireland	43
Shannon Scheme for the Electrification of the Irish Free State, 1929						52° 39' 49.89" N, 8° 37' 36.38" W
Sharp 14-inch Thin-Film-Transistor Liquid-Crystal Display (TFT-LCD) for TV, 1988	1988	10 June 2014	10	Kansai	141
Sharp 14-inch Thin-Film-Transistor Liquid-Crystal Display (TFT-LCD) for TV, 1988						34° 37' 18.02" N, 135° 49' 4.27" E
Shilling's Pioneering Contribution to Practical Telegraphy, 1828-1837	1828	18 May 2009	8	Russia (Northwest)	94
Shilling's Pioneering Contribution to Practical Telegraphy, 1828-1837						59° 56' 2.44" N, 30° 18' 7.67" E
Shoshone Transmission Line, 1909	1909	22 June 1991	5	Denver	20
Shoshone Transmission Line, 1909						39° 32' 45.67" N, 107° 19' 25.07" W
Single-element Unidirectional Microphone - Shure Unidyne, 1939	1939	31 January 2014	4	Chicago	137
Single-element Unidirectional Microphone - Shure Unidyne, 1939						42° 0' 44.68" N, 87° 46' 21.70" W
Speak & Spell, the First Use of a Digital Signal Processing IC for Speech Generation, 1978	1978	15 October 2009	5	Dallas	84
Speak & Spell, the First Use of a Digital Signal Processing IC for Speech Generation, 1978						32° 55' 31.38" N, 96° 45' 23.89" W
Special Citation Heinz Nixdorf Museum, 1996	1996	23 October 2021	8	Germany	3
Special Citation Heinz Nixdorf Museum, 1996						51° 43' 53.61" N, 8° 44' 11.61" E
Standardisation of the Ohm, 1861-1867	1861	17 September 2019	8	United Kingdom and Ireland	201
Standardisation of the Ohm, 1861-1867						55° 52' 22.88" N, 4° 17' 28.65" W
Stanford Linear Accelerator Center, 1962	1962	1 February 1984	6	Santa Clara Valley	4
Stanford Linear Accelerator Center, 1962						37° 25' 15.64" N, 122° 12' 21.90" W
Star of Laufenburg Interconnection, 1958	1958	18 August 2010	8	Switzerland	100
Star of Laufenburg Interconnection, 1958						47° 33' 15.00" N, 8° 3' 1.22" E
String Galvanometer, 1901-1905	1901	8 April 2022	8	Benelux	222
String Galvanometer, 1901-1905						52° 9' 58.06" N, 4° 28' 38.34" E
Superconducting Magnet System for the Fermilab Tevatron Accelerator/Collider, 1973-1985	1973	13 November 2017	4	Chicago	184
Superconducting Magnet System for the Fermilab Tevatron Accelerator/Collider, 1973-1985						41° 50' 18.82" N, 88° 15' 44.06" W
Superconductivity at 93 Kelvin, 1987	1987	19 August 2019	3	Huntsville	198
Superconductivity at 93 Kelvin, 1987						34° 43' 45.73" N, 86° 38' 29.29" W
TIROS I Television Infrared Observation Satellite, 1960	1960	27 September 2010	1	Princeton/Central Jersey	101
TIROS I Television Infrared Observation Satellite, 1960						40° 19' 54.07" N, 74° 37' 53.89" W
TPC-1 Transpacific Cable System, 1964	1964	11 November 2014	6 10	Hawaii Tokyo	148
TPC-1 Transpacific Cable System, 1964						21° 18' 34.88" N, 157° 51' 32.69" W
TRON Real-time Operating System Family, 1984	1984	14 October 2023	10	Tokyo	240
TRON Real-time Operating System Family, 1984						35° 42' 28.70" N, 139° 45' 45.69" E
Taum Sauk Pumped-Storage Electric Power Plant, 1963	1963	1 September 2005	5	Saint Louis	61
Taum Sauk Pumped-Storage Electric Power Plant, 1963						37° 19' 37.31" N, 91° 1' 27.37" W
The Birth of Electrodynamics, 1820-1827	1820	3 April 2023	8	France	233
The Birth of Electrodynamics, 1820-1827						48° 50' 43.22" N, 2° 20' 43.66" E
The CP/M Microcomputer Operating System, 1974	1974	25 April 2014	6	Santa Clara Valley	139
The CP/M Microcomputer Operating System, 1974						36° 37' 24.78" N, 121° 55' 23.93" W
The Development of RenderMan® for Photorealistic Graphics, 1981-1988	1981	8 December 2023	6	Oakland-East Bay	243
The Development of RenderMan® for Photorealistic Graphics, 1981-1988						37° 49' 57.62" N, 122° 17' 1.30" W
The Discovery of the Principle of Self-Complementarity in Antennas and the Mushiake Relationship, 1948	1948	27 July 2017	10	Sendai	179
The Discovery of the Principle of Self-Complementarity in Antennas and the Mushiake Relationship, 1948						38° 15' 12.66" N, 140° 52' 23.88" E
The First Submarine Transatlantic Telephone Cable System (TAT-1), 1956	1956	24 September 2006	7 8	Canadian Atlantic Newfoundland-Labrador United Kingdom and Ireland	70
The First Submarine Transatlantic Telephone Cable System (TAT-1), 1956						46° 13' 54.12" N, 60° 13' 19.63" W
The First Submarine Transatlantic Telephone Cable System (TAT-1), 1956						56° 22' 49.03" N, 5° 31' 24.62" W
The First Submarine Transatlantic Telephone Cable System (TAT-1), 1956						48° 8' 46.54" N, 53° 57' 50.76" W
The First Two-Dimensional Nuclear Magnetic Resonance Image (MRI), 1973	1973	5 September 2018	1	Long Island	190
The First Two-Dimensional Nuclear Magnetic Resonance Image (MRI), 1973						40° 54' 45.58" N, 73° 7' 47.59" W
The First Word Processor for the Japanese Language, 1971-1978	1971	1 November 2008	10	Tokyo	80
The First Word Processor for the Japanese Language, 1971-1978						35° 32' 6.97" N, 139° 41' 58.92" E
The Floating Gate EEPROM, 1976 - 1978	1976	20 August 2012	6	Santa Clara Valley	127
The Floating Gate EEPROM, 1976 - 1978						37° 25' 1.77" N, 121° 55' 15.34" W
The High Definition Television System, 1964-1989	1964	11 May 2016	10	Tokyo	160
The High Definition Television System, 1964-1989						35° 38' 8.33" N, 139° 36' 56.60" E
The MU (Middle and Upper atmosphere) radar, 1984	1984	13 May 2015	10	Kansai	155
The MU (Middle and Upper atmosphere) radar, 1984						34° 51' 8.00" N, 136° 6' 32.00" E
The Trans-Canada Microwave System, 1958	1958	1 July 2022	7	Canadian Atlantic Vancouver Winnipeg	227
The Trans-Canada Microwave System, 1958						49° 16' 52.00" N, 123° 6' 59.00" W
Thomas A. Edison West Orange Laboratories and Factories, 1887	1887	18 October 2008	1	North Jersey	76
Thomas A. Edison West Orange Laboratories and Factories, 1887						40° 46' 42.52" N, 74° 14' 20.58" W
Thomas Alva Edison Historic Site at Menlo Park, 1876	1876	9 September 2006	1	Princeton/Central Jersey	68
Thomas Alva Edison Historic Site at Menlo Park, 1876						40° 33' 54.11" N, 74° 20' 14.75" W
Tokaido Shinkansen (Bullet Train), 1964	1964	13 July 2000	10	Nagoya	35
Tokaido Shinkansen (Bullet Train), 1964						35° 6' 27.98" N, 136° 53' 8.04" E
Toshiba T1100, a Pioneering Contribution to the Development of Laptop PC, 1985	1985	29 October 2013	10	Tokyo	135
Toshiba T1100, a Pioneering Contribution to the Development of Laptop PC, 1985						35° 42' 51.54" N, 139° 25' 24.90" E
Trans-Atlantic Telephone Fiber-Optic Submarine Cable (TAT-8), 1988	1988	19 May 2016	1	New Jersey Coast	164
Trans-Atlantic Telephone Fiber-Optic Submarine Cable (TAT-8), 1988						40° 23' 50.79" N, 74° 8' 8.17" W
Transcontinental Telegraph, 1861	1861	5 August 1990	5	Denver	16
Transcontinental Telegraph, 1861						42° 12' 7.45" N, 104° 33' 55.09" W
Transmission of Transatlantic Radio Signals, 1901	1901	12 December 2001	8	United Kingdom and Ireland	37
Transmission of Transatlantic Radio Signals, 1901						50° 1' 56.57" N, 5° 15' 20.75" W
Two-Way Police Radio Communication, 1933	1933	1 May 1987	1	North Jersey	10
Two-Way Police Radio Communication, 1933						40° 40' 3.37" N, 74° 7' 6.38" W
US Naval Computing Machine Laboratory, 1942-1945	1942	1 October 2001	2	Dayton	39
US Naval Computing Machine Laboratory, 1942-1945						39° 43' 42.05" N, 84° 12' 3.33" W
Vapor-phase Axial Deposition Method for Mass Production of High-quality Optical Fiber, 1977-1983	1977	21 May 2015	10	Tokyo	156
Vapor-phase Axial Deposition Method for Mass Production of High-quality Optical Fiber, 1977-1983						35° 26' 26.62" N, 139° 18' 51.02" E
Virginia Smith High-Voltage Direct-Current Converter Station, 1988	1988	21 May 2015	5	Denver	157
Virginia Smith High-Voltage Direct-Current Converter Station, 1988						39° 42' 25.53" N, 105° 8' 13.57" W
Volta's Electrical Battery Invention, 1799	1799	15 September 1999	8	Italy	27
Volta's Electrical Battery Invention, 1799						45° 48' 48.69" N, 9° 4' 31.48" E
Vucje Hydroelectric Plant, 1903	1903	25 June 2005	8	Serbia and Montenegro	59
Vucje Hydroelectric Plant, 1903						42° 52' 0.00" N, 21° 55' 0.00" E
Vulcan Street Plant, 1882	1882	15 September 1977	4	Northeastern Wisconsin	1
Vulcan Street Plant, 1882						44° 14' 51.50" N, 88° 24' 14.83" W
WEIZAC Computer, 1955	1955	5 December 2006	8	Israel	69
WEIZAC Computer, 1955						31° 53' 33.26" N, 34° 47' 52.16" E
WaveLAN, Precursor of Wi-Fi, 1987	1987	29 October 2019	8	Benelux	204
WaveLAN, Precursor of Wi-Fi, 1987						52° 1' 39.40" N, 5° 5' 7.10" E
Westinghouse Atom Smasher, 1937	1937	1 May 1985	2	Pittsburgh	7
Westinghouse Atom Smasher, 1937						40° 26' 4.93" N, 79° 53' 26.04" W
Westinghouse Radio Station KDKA, 1920	1920	1 June 1994	2	Pittsburgh	25
Westinghouse Radio Station KDKA, 1920						40° 27' 15.05" N, 79° 53' 26.04" W
Weston Meters, 1887-1893	1887	23 September 2016	1	North Jersey	169
Weston Meters, 1887-1893						40° 44' 28.35" N, 74° 10' 43.26" W
Whirlwind Computer, 1944-59	1944	27 June 2012	1	Boston	124
Whirlwind Computer, 1944-59						42° 21' 40.48" N, 71° 5' 47.99" W
World's First Low-Loss Optical Fiber for Telecommunications, 1970	1970	1 May 2012	1	Rochester	121
World's First Low-Loss Optical Fiber for Telecommunications, 1970						42° 9' 43.27" N, 77° 5' 38.89" W
World's First Reliable High Voltage Power Fuse, 1909	1909	3 August 2012	4	Chicago	126
World's First Reliable High Voltage Power Fuse, 1909						42° 0' 5.28" N, 87° 40' 45.72" W
Yosami Radio Transmitting Station, 1929	1929	19 May 2009	10	Nagoya	81
Yosami Radio Transmitting Station, 1929						34° 58' 27.02" N, 137° 1' 0.74" E
Zenit Parabolic Reflector L-band Pulsed Radar, 1938	1938	31 May 2017	8	Ukraine	177
Zenit Parabolic Reflector L-band Pulsed Radar, 1938						50° 0' 14.48" N, 36° 13' 42.05" E