H04M 1/57 Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set (at the operator set in a manual exchange H04M5/20)
Introduced: July 1974
Title
Titles differ between systems:
IPC: Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set
CPC: Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set (at the operator set in a manual exchange H04M5/20)
Full Title
Full titles differ between systems:
Substation equipment, e.g. for use by subscribers > Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set
Substation equipment, e.g. for use by subscribers (subscriber services or facilities provided at exchanges H04M3/00; prepayment telephone coin boxes H04M17/00; current supply arrangements H04M19/08) > Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set (at the operator set in a manual exchange H04M5/20)
Of 3 combined children, 0 exist in both systems.
3 codes are CPC-only extensions.
Child Classifications
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