US PATENT SUBCLASS 52 / 183
.~ Interconnected relatively movable components

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

182  DF  STEPPED; E.G., STAIR {6}
183.~ Interconnected relatively movable components

DEFINITION

Classification: 52/183

(under subclass 182) Structure having means forming a connection between at least two step forming components which allow relative movement between them, e.g., folding stairs.