US PATENT SUBCLASS 388 / 851
.~.~ By patterned switch

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}
849  DF  .~ Field control, or field and armature control {3}
851.~.~ By patterned switch

DEFINITION

Classification: 388/851

By patterned switch:

(under subclass 849) Subject matter wherein acceleration of the motor is controlled by a mechanical device which makes and breaks the motor circuit according to a predetermined pattern.