US PATENT SUBCLASS 246 / 458
.~.~ Frogs

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

454  DF  CROSSINGS, FROGS, AND MATES {11}
457  DF  .~ Flange-supported wheel {1}
458.~.~ Frogs

DEFINITION

Classification: 246/458

(under subclass 457) Subject matter having frogs provided with flange-bearing risers.