US PATENT SUBCLASS 246 / 417
.~ Frog obviating

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

415 R  DF  SWITCHES {21}
417.~ Frog obviating {1}
418  DF  .~.~> Single ral

DEFINITION

Classification: 246/417

(under subclass 415) Subject matter having a switch so constructed as to obviate the use of rigid or spring rail frogs or movable-rail substitutes for frogs, one or more movable devices performing the double function of a frog and a switch.