US PATENT SUBCLASS 105 / 434
.~.~.~ Spring

Current as of: June, 1999
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105 /   HD   RAILWAY ROLLING STOCK

425  DF  PLATFORMS {2}
426  DF  .~ Trapdoors {6}
432  DF  .~.~ Actuators {2}
434.~.~.~ Spring

DEFINITION

Classification: 105/434

(under subclass 432) Actuators for trap doors, comprising spring devices for throwing up or aiding in throwing up the doors.