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duplex circuit

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use in telegraph circuitry

  • White House Telegraph Room, 1898
    In telegraph: Signal processing and transmission

    …States completed refinement of the duplex transmission system originated in Germany by Wilhelm Gintl, which allowed the same line to be used simultaneously for sending and receiving, thus doubling its capacity. This system was further improved by the American inventor Thomas Alva Edison, who patented a quadraplex telegraph system in…

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