|Categories||People and organizations , Engineers , Inventors , Signals , Signal generation & recording , Audio recording , Computing and electronics , Electronic components , Acoustics , Materials , Elements , Carbon , Engineering and society , Military applications , World War II , Leisure , Music , News|
"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by Semantic MediaWiki.
|13:13:17, 20 July 2018 +|
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