by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses

Introduced: July 1974

Last revised: January 2006

Full Title

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 > by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses

Classification Context

Section:: ELECTRICITY
Class:: ELECTRIC COMMUNICATION TECHNIQUE
Subclass:: TELEPHONIC COMMUNICATION

5 direct subcodes

Child Classifications

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H04M 1/315 Clutches; Spring assemblies; Speed regulators, e.g. centrifugal brakes
H04M 1/32 Locking setting devices during transmission to prevent interference by user
H04M 1/34 Lost-motion or other arrangements for ensuring a pause between successive digit transmissions
H04M 1/38 Pulses transmitted by a movement variably limited by the setting of a stop
H04M 1/4 wherein the setting-operation short-circuits or open-circuits the transmitting mechanism during a variable part of a cycle