audio tone keyer

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Morse code — Chart of the Morse code letters and numerals Morse code is a method of transmitting textual information as a series of on off tones, lights, or clicks that can … Wikipedia
Telecommunications device for the deaf — Miniprint 425 TDD. The acoustic coupler on the top is for use with telephone handsets. The printer records the conversation. The specific GA and SK keys allow for speedier use of common abbreviations. A telecommunications device for the deaf… … Wikipedia

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