US PATENT SUBCLASS 388 / 837
.~.~ By periodic mechanical switch

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}
837.~.~ By periodic mechanical switch

DEFINITION

Classification: 388/837

By periodic mechanical switch:

(under subclass 830) Subject matter wherein running speed is controlled by means of a mechanical switch which operates repetitiously at a predetermined rate.