US PATENT SUBCLASS 246 / 27
.~ Automatic

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

20  DF  BLOCK-SIGNAL SYSTEMS {4}
27.~ Automatic {5}
28 R  DF  .~.~> Electric {18}
93  DF  .~.~> Combined fluid pessure and electric {2}
96  DF  .~.~> Electromechanical {3}
100  DF  .~.~> Fluid pressure {1}
102  DF  .~.~> Mechanical {1}

DEFINITION

Classification: 246/27

(under subclass 20) Systems having train-control devices which operate automatically without direct human intervention.

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21, and appropriate indented subclasses for automatic systems in combination with manually-actuated signals.