US PATENT SUBCLASS 388 / 824
.~.~ By variable impedance (e.g., potentiometer)

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

800  DF  CLOSED LOOP SPEED CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR {4}
816  DF  .~ Analog armature control {6}
824.~.~ By variable impedance (e.g., potentiometer)

DEFINITION

Classification: 388/824

By variable impedance (e.g., potentiometer):

(under subclass 816) Subject matter wherein the control circuit includes a variable impedance device.

(1) Note. Variable impedance devices include potentiometers, variable inductors, and variable capacitors.