US PATENT SUBCLASS 246 / 221
.~ Motor systems

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

218  DF  ELECTRIC ACTUATION {9}
221.~ Motor systems {5}
222  DF  .~.~> Return-indication-current generation
223  DF  .~.~> Three-position signals
224  DF  .~.~> Home and distant signals
225  DF  .~.~> Reciprocating armature {4}
240  DF  .~.~> Rotary armature {3}

DEFINITION

Classification: 246/221

(under subclass 218) Subject matter having electric-motor means placed upon the roadway and especially adapted for actuating switches, signals, and other similar movable elements of this class.