US PATENT SUBCLASS 182 / 158
.~.~.~ Mechanical or power-extending means

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

152  DF  UNITARY FOLDABLE, RIGID SCAFFOLD OR LADDER {2}
156  DF  .~ Collapsible ladder {3}
157  DF  .~.~ Lazy tong type {1}
158.~.~.~ Mechanical or power-extending means

DEFINITION

Classification: 182/158

(under subclass 157) Device provided with mechanical or power means for extending the lazy tong structure.

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40+, for an upwardly extensible flexible ladder.