US PATENT SUBCLASS 246 / 469
.~.~ Unbroken main

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

454  DF  CROSSINGS, FROGS, AND MATES {11}
468  DF  .~ Frogs {3}
469.~.~ Unbroken main

DEFINITION

Classification: 246/469

(under subclass 468) Subject matter having a frog in which the wheels are raised and carried over the unbroken main track by means of fixed elevated side rails or risers.

SEE OR SEARCH THIS CLASS, SUBCLASS:

421, 432 and 455, for risers.