H04M1/31 - CPC Classification

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

• H04M1/312 » {pulses produced by electronic circuits} 2
• H04M1/315 » Clutches, spring assemblies, speed regulators, e.g. centrifugal brakes 0
• H04M1/32 » Locking setting devices during transmission to prevent interference by user 3
• H04M1/34 » Lost-motion or other arrangements for ensuring a pause between successive digit transmissions 0
• H04M1/38 » Pulses transmitted by a movement variably limited by the setting of a stop 2
• H04M1/40 » wherein the setting-operation short-circuits or open-circuits the transmitting mechanism during a variable part of a cycle 0