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Telegraph (disambiguation) : ウィキペディア英語版 | Telegraph (disambiguation)
Telegraph is the apparatus or process for long distance transmission of textual messages without the physical exchange of an object bearing the message. Telegraph may also refer to: ==Communication==
* Electrical telegraph, a form of telegraph that uses electric signals * Printing telegraph, a form of electrical telegraph that uses plain text instead of Morse Code * Optical telegraph, or semaphore line * Hydraulic telegraph, a telegraph based on the displacement of water between signals, or by the movement of an indicator at the end of a hydraulic circuit * Teleprinter * Engine order telegraph * Telautograph
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