US PATENT SUBCLASS 246 / 320 R
.~.~.~ Spiral spring

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

270 R  DF  VEHICLE-ENERGY ACTUATION {11}
314  DF  .~ Switches, automatic {6}
319  DF  .~.~ Trailing fly-back {1}
320 R.~.~.~ Spiral spring {2}
321  DF  .~.~.~.~> Tie or connecting rod
320 A  DF  .~.~.~.~> Dash pot

Unofficial Alpha Subclasses: R A

DEFINITION

Classification: 246/320

(under subclass 319) Subject matter in which the switch is returned automatically to its original position by the power on one or more spiral springs.