US PATENT SUBCLASS 246 / 463
.~ Bolted


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

454  DF  CROSSINGS, FROGS, AND MATES {11}
463.~ Bolted


DEFINITION

Classification: 246/463

(under subclass 454) Subject matter having crossings, frogs, and mates built up from rail-pieces spaced by filler-blocks and secured by bolts passing through the fillers and through the webs of the rails.