US PATENT SUBCLASS 280 / 166
.~.~.~ Shiftable
Current as of: June, 1999
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DEFINITION
Classification: 280/166
(under subclass 163) Steps having means permitting the step to be moved to various positions.
SEE OR SEARCH CLASS
182, Fire Escape, Ladder, or Scaffold,
91, for a wall or floor attached pivoted step.