US PATENT SUBCLASS 105 / 431
.~.~.~ Convertible

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

425  DF  PLATFORMS {2}
426  DF  .~ Trapdoors {6}
430  DF  .~.~ With steps {1}
431.~.~.~ Convertible

DEFINITION

Classification: 105/431

(under subclass 430) Trap doors which may be converted into a series of steps, and vice versa.