Electromechanical Telephone-Switching: Revision history

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9 January 2015

7 January 2015

  • curprev 18:0818:08, 7 January 2015‎ Administrator1 talk contribs‎ 23,862 bytes +23,862‎ Created page with "== Citation == Originally, all telephone calls required the participation of an operator. This began to change when a crude automatic switch, invented by Almon Strowger, was..."
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