US PATENT SUBCLASS 388 / 833
.~.~ By voltage or current modification

Current as of: June, 1999
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388 /   HD   ELECTRICITY: MOTOR CONTROL SYSTEMS

825  DF  OPEN LOOP SPEED CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR {3}
830  DF  .~ Analog armature control {7}
833.~.~ By voltage or current modification

DEFINITION

Classification: 388/833

By voltage or current modification:

(under subclass 830) Subject matter wherein the control circuitry functions by adjusting the amplitude of the voltage or current which is applied to the input circuit of a motor.