US PATENT SUBCLASS 246 / 50
.~.~.~.~.~ Current characteristic

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}
46  DF  .~.~.~.~ Line-wire distant control {5}
50.~.~.~.~.~ Current characteristic

DEFINITION

Classification: 246/50

(under subclass 46) Systems in which the distant signal is actuated or controlled by changes in the direction of current-flow or in some other characteristic or the current in a circuit other than the track-circuit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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

38, 44, 45 and 60, for current characteristic control.

39, 46 and 60+, for line-wire systems of control.