DIFF Subgroup
H04M 5/20 Arrangements for indicating the numbers of the incoming lines
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Manual exchanges > Arrangements for signalling the class or number of called or calling line from one exchange to another > Arrangements for indicating the numbers of the incoming lines
CPC:
Manual exchanges (substation equipment in general H04M1/00) > Arrangements for signalling the class or number of called or calling line from one exchange to another > Arrangements for indicating the numbers of the incoming lines
No child classifications to compare. This is a leaf node in both IPC and CPC.