US PATENT SUBCLASS 182 / 89
.~ Spring-biased pivoted step or ladder

Current as of: June, 1999
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182 /   HD   FIRE ESCAPE, LADDER, OR SCAFFOLD

82  DF  WALL- OR FLOOR-ATTACHED {7}
89.~ Spring-biased pivoted step or ladder

DEFINITION

Classification: 182/89

(under subclass 82) Device wherein a pivoted ladder or step is biased in or out of use position by spring means.