Apparatus or circuits at the transmitting end

Full Title

Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code (teaching apparatus therefor G09B; telegraph tapping keys H01H21/86) > Apparatus or circuits at the transmitting end

5 direct subcodes

Child Classifications

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H04L 15/06 with a restricted number of keys, e.g. separate key for each type of code element
H04L 15/12 with keyboard co-operating with code-bars
H04L 15/16 with keyboard co-operating with code discs
H04L 15/18 Automatic transmitters, e.g. controlled by perforated tape
H04L 15/22 Apparatus or circuits for sending one or a restricted number of signals, e.g. distress signals