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PCE
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DIFF Subgroup
H04M 5/12

Calling substations, e.g. by ringing

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Manual exchanges > Calling substations, e.g. by ringing

CPC:

Manual exchanges (substation equipment in general H04M1/00) > Calling substations, e.g. by ringing

No child classifications to compare. This is a leaf node in both IPC and CPC.