US PATENT SUBCLASS 246 / 84
.~.~.~.~.~ Trolley or plow

Current as of: June, 1999
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246 /   HD   RAILWAY SWITCHES AND SIGNALS

20  DF  BLOCK-SIGNAL SYSTEMS {4}
27  DF  .~ Automatic {5}
28 R  DF  .~.~ Electric {18}
81  DF  .~.~.~ Propulsion-current signaling {3}
83  DF  .~.~.~.~ Car-actuated controller {1}
84.~.~.~.~.~ Trolley or plow

DEFINITION

Classification: 246/84

(under subclass 83) Subject matter having circuit-controllers actuated by the trolley-arm plow or other current-collector.

SEE OR SEARCH THIS CLASS, SUBCLASS:

72, 77, and appropriate indented subclasses, and 81, for systems making use of propulsion-current.