US PATENT SUBCLASS 246 / 252
.~.~ Trolley or plow actuated


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

218  DF  ELECTRIC ACTUATION {9}
246  DF  .~ Car-actuated circuit controllers {6}
252.~.~ Trolley or plow actuated


DEFINITION

Classification: 246/252

(under subclass 246) Subject matter in which a circuit controller is supported by the trolley-wire or third rail and actuated mechanically by the current-collector.

SEE OR SEARCH THIS CLASS, SUBCLASS:

31, 72, 81, 84, 90, 91, 126, and 246+, for circuit-controllers actuated by the wheels or other devices, not trolleys, carried by the car.

SEE OR SEARCH CLASS

200, Electricity: Circuit Makers and Breakers, appropriate subclasses for the structure of switches, and particularly

52+, for circuit makers and breakers of special application.