DIFF Subgroup
H04M 5/04 Arrangements for indicating calls or supervising connections for calling or clearing
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Manual exchanges > Arrangements for indicating calls or supervising connections for calling or clearing
CPC:
Manual exchanges (substation equipment in general H04M1/00) > Arrangements for indicating calls or supervising connections for calling or clearing
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
Child Classifications
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