US PATENT SUBCLASS 246 / 45
.~.~.~.~.~ Current reversal

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

20  DF  BLOCK-SIGNAL SYSTEMS {4}
27  DF  .~ Automatic {5}
28 R  DF  .~.~ Electric {18}
41  DF  .~.~.~ Direct current, normally closed, track circuit {4}
44  DF  .~.~.~.~ Wireless distant control {1}
45.~.~.~.~.~ Current reversal

DEFINITION

Classification: 246/45

(under subclass 44) Systems in which a reversal of the direction of current flow is used for controlling the distant signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

26, 34+, 41+, 58+, 95, 98, 128+, and 130, for track-circuit systems.

38, 50 and 60, for wireless systems.