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

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

Classification Context

Section:

ELECTRICITY

Class:

ELECTRIC COMMUNICATION TECHNIQUE

Subclass:

TELEPHONIC COMMUNICATION

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
• H04M 1/5 by generating or selecting currents of predetermined frequencies or combinations of frequencies