US PATENT SUBCLASS 246 / 112
.~ Semi-automatic

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

111  DF  GRADE-CROSSING TRACK PROTECTION {3}
112.~ Semi-automatic

DEFINITION

Classification: 246/112

(under subclass 111) Subject matter in which the train automatically cooperates with human agency in the actuation or control of the traffic devices.

SEE OR SEARCH THIS CLASS, SUBCLASS:

21+, for semi-automatic block-signaling systems.

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