US PATENT SUBCLASS 246 / 223
.~.~ Three-position signals


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246 /   HD   RAILWAY SWITCHES AND SIGNALS

218  DF  ELECTRIC ACTUATION {9}
221  DF  .~ Motor systems {5}
223.~.~ Three-position signals


DEFINITION

Classification: 246/223

(under subclass 221) Subject matter especially adapted for actuating three-position signals.

SEE OR SEARCH THIS CLASS, SUBCLASS:

38, 44 and 45, for so-called "wireless" controls" in block-signaling systems.

39, and 46+, for line-wire control in block signaling systems.

53, for details of three-position-signal actuation in block signaling systems.

60, for general schemes of three-position-signal control.

224, for motor means for actuating home and distant signals upon the same mast. 479+, for the structure of semaphores.