US PATENT SUBCLASS 246 / 81
.~.~.~ Propulsion-current signaling

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}
81.~.~.~ Propulsion-current signaling {3}
82  DF  .~.~.~.~> Rotary controller
83  DF  .~.~.~.~> Car-actuated controller {1}
85  DF  .~.~.~.~> Intermittent contact

DEFINITION

Classification: 246/81

(under subclass 28) Subject matter having the propulsion-current used to actuate or control the signals of the block.

SEE OR SEARCH THIS CLASS, SUBCLASS:

72, for propulsion-current signaling.