US PATENT SUBCLASS 52 / 188
.~ Tread unit on horizontal tread member connected to riser

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

182  DF  STEPPED; E.G., STAIR {6}
188.~ Tread unit on horizontal tread member connected to riser

DEFINITION

Classification: 52/188

(under subclass 182) Structure in which a horizontal surface (tread) member, is supported above another discrete horizontal member, the latter being connected to a vertical front member (riser).