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Vehicle Radio-Telephone SystemsThe first experiments in radio communication with automobiles were made in 1921 in connection with police systems.54 Beginning in 1947, two-way radio-telephone service was given from the public telephone system to vehicles. A telephone user may place a call for a vehicle in much the same manner as a toll call is placed. One or more 250-watt transmitters cover a given area, and several receiving stations are located in the area.55 At the beginning of 1949, about 5000 vehicles were equipped for this growing service.
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Last Update: 2011-05-28