US PATENT SUBCLASS 246 / 471
.~.~ Composite

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}
471.~.~ Composite

DEFINITION

Classification: 246/471

(under subclass 468) Subject matter having frogs of composite (mostly horizontal) structure built up in various ways from pieces of wrought or cast metal other than pieces of rail.