polarential telegraph system

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Polarential telegraph system — A polarential telegraph system is a direct current telegraph system employing polar transmission in one direction and a form of differential duplex transmission in the other. [cite book|title=IEEE Standard Dictionary of Electrical and Electronics … Wikipedia
List of electronics topics — Alphabetization has been neglected in some parts of this article (the b section in particular). You can help by editing it. This is a list of communications, computers, electronic circuits, fiberoptics, microelectronics, medical electronics,… … Wikipedia

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