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PCE
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Search for IPC and CPC classification codes or keywords
CPC Subgroup
H04L 15/14

combined with perforating apparatus

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 > with keyboard co-operating with code-bars > combined with perforating apparatus