DIFF Subgroup
H04L 15/30 Writing recorders
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code > Apparatus or circuits at the receiving end > Code reproducing apparatus > Writing recorders
CPC:
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 receiving end > Code reproducing apparatus > Writing recorders
No child classifications to compare. This is a leaf node in both IPC and CPC.