US PATENT SUBCLASS 105 / 435
.~.~ Locks and starters

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

425  DF  PLATFORMS {2}
426  DF  .~ Trapdoors {6}
435.~.~ Locks and starters

DEFINITION

Classification: 105/435

(under subclass 426) Trap doors having locks for holding them down and starters for initiating the opening movement of the trap after it is unlocked.