Devices which can set up and transmit only one digit at a time

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Substation equipment, e.g. for use by subscribers > Devices for calling a subscriber > Devices which can set up and transmit only one digit at a time

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) > Devices which can set up and transmit only one digit at a time

IPC and CPC are identically structured here. All 2 subcodes exist in both systems.

Child Classifications

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H04M 1/31 by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses since 1974 +1 CPC IPC+CPC Available in IPC and CPC
H04M 1/50 by generating or selecting currents of predetermined frequencies or combinations of frequencies +1 CPC IPC+CPC Available in IPC and CPC