DIFF Subgroup
H04M 19/04 the ringing-current being generated at the substations
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Current supply arrangements for telephone systems > providing ringing current or supervisory tones, e.g. dialling tone or busy tone > the ringing-current being generated at the substations
CPC:
Current supply arrangements for telephone systems (for selecting-equipment H04Q1/28) > providing ringing current or supervisory tones, e.g. dialling tone or busy tone > the ringing-current being generated at the substations
Of 5 combined children, 0 exist in both systems.
5 codes are CPC-only extensions.
Child Classifications
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