Clutches; Spring assemblies; Speed regulators, e.g. centrifugal brakes (H04M1/32 – H04M1/40 take precedence)

Full Title

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 > by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses > Clutches; Spring assemblies; Speed regulators, e.g. centrifugal brakes (H04M1/32 – H04M1/40 take precedence)