US PATENT SUBCLASS 318 / 75
.~.~.~.~.~.~ Plural switches connected in series

Current as of: June, 1999
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318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

34  DF  PLURAL, DIVERSE OR DIVERSELY CONTROLLED ELECTRIC MOTORS {22}
66  DF  .~ Running-speed control {4}
68  DF  .~.~ Relative motor speed control {5}
69  DF  .~.~.~ With speed-difference detector {2}
70  DF  .~.~.~.~ Electrical-type detectors {4}
74  DF  .~.~.~.~.~ Synchronously actuated switch detectors {1}
75.~.~.~.~.~.~ Plural switches connected in series

DEFINITION

Classification: 318/75

(under subclass 74) Subject matter in which the detector comprises two or more electric switches connected electrically in series with each other.