US PATENT SUBCLASS 182 / 41
.~ Self-rigidifying

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

40  DF  UPWARDLY EXTENSIBLE FLEXIBLE LADDER OR ESCAPE {1}
41.~ Self-rigidifying

DEFINITION

Classification: 182/41

(under subclass 40) Device including means to simultaneously rigidify and extend the supple escape means.