US PATENT SUBCLASS 388 / 807
.~.~.~ With variable impedance

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}
803  DF  .~ Field control, or field and armature control, by analog (only) circuitry {4}
806  DF  .~.~ By voltage or current modification {1}
807.~.~.~ With variable impedance

DEFINITION

Classification: 388/807

With variable impedance:

(under subclass 806) Subject matter wherein the control circuit includes a variable impedance device.

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