US PATENT SUBCLASS 246 / 128
.~ Normally open 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}
128.~ Normally open track circuit {1}
129  DF  .~.~> Short sectional rail closure


DEFINITION

Classification: 246/128

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

SEE OR SEARCH THIS CLASS, SUBCLASS:

58+, for systems of open-track-circuit control.

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