CPC Main Group
H04L 15/00 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)
3 direct subcodes
Child Classifications
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- H04L 15/03 Keys structurally combined with sound generators
- H04L 15/04 Apparatus or circuits at the transmitting end
- H04L 15/24 Apparatus or circuits at the receiving end