US PATENT SUBCLASS 246 / 477
.~ Roadway, visual, and portable

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

473 R  DF  SIGNALS {12}
477.~ Roadway, visual, and portable

DEFINITION

Classification: 246/477

(under subclass 473) Subject matter having visual signals adapted to be temporarily placed upon or secured to the permanent way to advise approaching trains of danger ahead.

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207, for portable track trips.