US PATENT SUBCLASS 246 / 22
.~.~ Electromanual

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

20  DF  BLOCK-SIGNAL SYSTEMS {4}
21  DF  .~ Semi-automatic {1}
22.~.~ Electromanual {3}
23  DF  .~.~.~> Cab signal or train control
24  DF  .~.~.~> Circuit controllers
25  DF  .~.~.~> Lock and block {1}

DEFINITION

Classification: 246/22

(under subclass 21) Systems in which the train uses electrical means in performing its automatic function.

(1) Note. This subclass includes the so-called "controlled-manual-block" systems.

SEE OR SEARCH THIS CLASS, SUBCLASS:

105, 106, 112, 160, 164, 165, and 183, for manual-control features.