Statistics for occurrence #1 of “Dr. Gentl” in chapter 4, entry duplextelegraph of Knight's Mechanical Encyclopedia:
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A telegraph so arranged that messages can be simultaneously transmitted in opposite directions on the same line-wire.
The first telegraph of this kind was devised by Dr. Gentl of Austria, in 1853, and modified by Frieschen and Siemens-Holske in 1854; but it is only within the past few years that any duplex systems have been put into successful operation, and, up to this ti...
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