US PATENT SUBCLASS 246 / 182 R
.~ Speed-control systems

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

167 R  DF  CAB SIGNAL OR TRAIN CONTROL {20}
182 R.~ Speed-control systems {6}
182 A  DF  .~.~> Track brake speed control
182 B  DF  .~.~> Automatic vehicle-carried braking
182 BH  DF  .~.~> Humped, unpowered cars
182 C  DF  .~.~> Automatic vehicle-carried speed comparison circuits
182 AA  DF  .~.~> Yard-switching, dispersed
182 AB  DF  .~.~> Yard-switching, centralized

Unofficial Alpha Subclasses: R A B BH C AA AB

DEFINITION

Classification: 246/182

(under subclass 167) Subject matter having speed-control means which is inoperative below but operative above predetermined speeds when predetermined points are reached.

SEE OR SEARCH THIS CLASS, SUBCLASS:

167, and all subclasses mentioned in the search notes appended thereto, for cab and control features.

206, for structure of fixed track-trips.

SEE OR SEARCH CLASS

73, Measuring and Testing, 488+, for a speed-responsive device, per se.