US PATENT SUBCLASS 246 / 275
.~ Continuous-rail frogs


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

270 R  DF  VEHICLE-ENERGY ACTUATION {11}
275.~ Continuous-rail frogs {1}
276  DF  .~.~> Spring rail


DEFINITION

Classification: 246/275

(under subclass 270) Subject matter having movable-rail frogs which are set automatically by an approaching train, so as to secure unbroken line of rails.

SEE OR SEARCH THIS CLASS, SUBCLASS:

274, 382+ and 468+, for frog structure.

375, and 382, and appropriate indented subclasses for movable-rail frogs.