US PATENT SUBCLASS 52 / 190
.~.~ Integral tread and riser

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

182  DF  STEPPED; E.G., STAIR {6}
189  DF  .~ Precast stonelike component {1}
190.~.~ Integral tread and riser

DEFINITION

Classification: 52/190

(under subclass 189) Structure in which a tread and riser are cast as a monolith.