US PATENT SUBCLASS 105 / 428
.~.~ Diagonal sectional

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

425  DF  PLATFORMS {2}
426  DF  .~ Trapdoors {6}
428.~.~ Diagonal sectional

DEFINITION

Classification: 105/428

(under subclass 426) Trap doors cut across diagonally and hinged together along the cut, so as to be foldable.