318, Electricity: Motive Power Systems, subclass 130 for reciprocating motor systems wherein the energizing winding circuit of the motor is supplied by an electrical oscillator, and subclass 341 for electric motor control systems wherein the motor armature or primary circuit is supplied by an adjustable frequency or impulse generator or oscillator to control or vary the motor speed.
(318, Electricity; subclass; 130; for reciprocating motor systems)
318, Electricity
subclass
130 for reciprocating motor systems