US PATENT SUBCLASS 182 / 167
.~.~ With step registration

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

165  DF  LADDER WITH PIVOTED PROP {9}
166  DF  .~ Section extensible below prop pivot {1}
167.~.~ With step registration

DEFINITION

Classification: 182/167

(under subclass 166) Device including means to hold steps of one section in registry with those of another section.