US PATENT SUBCLASS 182 / 149
.~ Trestle-type support, beam-elevating

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

141  DF  PLATFORM WITH ELEVATING OR LOWERING MEANS {3}
149.~ Trestle-type support, beam-elevating

DEFINITION

Classification: 182/149

(under subclass 141) Device wherein a trestle is provided with mechanical means for shifting component parts thereof to vary the height of its beam.