Circuit arrangements for preventing eavesdropping

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Substation equipment, e.g. for use by subscribers > Circuit arrangements for preventing eavesdropping

CPC:

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) > Circuit arrangements for preventing eavesdropping

IPC and CPC are identically structured here. All 1 subcodes exist in both systems.

Child Classifications

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H04M 1/70 Lock-out or secrecy arrangements in party-line systems IPC+CPC Available in IPC and CPC