Devices for calling a subscriber (H04M1/66 takes precedence)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Devices for calling a subscriber

CPC: Devices for calling a subscriber (H04M1/66 takes precedence)

Full Title

Full titles differ between systems:

IPC:

Substation equipment, e.g. for use by subscribers > Devices for calling a subscriber

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) > Devices for calling a subscriber (H04M1/66 takes precedence)

IPC and CPC are identically structured here. All 5 subcodes exist in both systems.

Child Classifications

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H04M 1/27 Devices whereby a plurality of signals may be stored simultaneously since 1974 +1 CPC IPC+CPC Available in IPC and CPC
H04M 1/30 Devices which can set up and transmit only one digit at a time IPC+CPC Available in IPC and CPC
H04M 1/515 by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of DC signals of alternating polarity, coded pulses or impedance dialling since 1974 IPC+CPC Available in IPC and CPC
H04M 1/52 Arrangements wherein a dial or the like is mechanically coupled to a line selector IPC+CPC Available in IPC and CPC
H04M 1/53 Generation of additional signals, e.g. additional pulses since 1974 IPC+CPC Available in IPC and CPC