Word: plex
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Dates: during 1924-1924
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...Manufacturing Co. The A. T. & T., which operates station WEAK, New York, of course, has a practical monopoly of the telephone and telegraph wires, thus enabling it to control by tolls any radio inventions requiring the use of long-distance wires as connecting links, such as the multi-plex telephone and telegraph carrier systems. Also in 1917, before the radio fad had developed, it purchased from Lee DeForest, leading radio inventor, the patent rights of his audion vacuum tube, which is basic to all amplifying systems...