US PATENT SUBCLASS 246 / 130
.~ Normally closed track circuit

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

125  DF  ELECTRIC AUTOMATIC HIGHWAY SIGNALS, MINE DOORS, AND GATES {3}
130.~ Normally closed track circuit

DEFINITION

Classification: 246/130

(under subclass 125) Subject matter where the controlling track-circuit is normally closed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

26, 41, and appropriate indented subclasses, and 98, for normally closed track-circuits.

111, 125, 260, 293, and 473, and appropriate indented subclasses, for signal structure.