US PATENT SUBCLASS 388 / 855
.~.~ By selectable or variable impedance

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

848  DF  OPEN LOOP ACCELERATION CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR {2}
853  DF  .~ Armature control {2}
855.~.~ By selectable or variable impedance {2}
856  DF  .~.~.~> By insertion of resistance or shorting of circuit {2}
860  DF  .~.~.~> Manual

DEFINITION

Classification: 388/855

By selectable or variable impedance:

(under subclass 853) Subject matter wherein the control circuit includes a variable impedance device or a set of fixed impedance devices which are selectable by switches, or other means.

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