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PCE
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Search for IPC and CPC classification codes or keywords
DIFF Subgroup
H04M 1/74

with means for reducing interference; with means for reducing effects due to line faults

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Substation equipment, e.g. for use by subscribers > Interface circuits for coupling substations to external telephone lines > with means for reducing interference; with means for reducing effects due to line faults

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) > Interface circuits for coupling substations to external telephone lines (H04M1/78 takes precedence) > with means for reducing interference; with means for reducing effects due to line faults

Of 1 combined children, 0 exist in both systems.

1 codes are CPC-only extensions.

Child Classifications

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