US PATENT SUBCLASS 246 / 120
ROADWAY-DEFECT PROTECTION

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

120ROADWAY-DEFECT PROTECTION {1}
121  DF  .~> Electric

DEFINITION

Classification: 246/120

(under the class definition) Subject matter having signals, indicators, and train-controlling devices which are automatically set at "danger" by the occurrence of any defect in the permanent way, including bridges.

SEE OR SEARCH THIS CLASS, SUBCLASS:

111+, 118 and 220, for analogous systems.