US PATENT SUBCLASS 52 / 187
.~ Helical type

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

182  DF  STEPPED; E.G., STAIR {6}
187.~ Helical type

DEFINITION

Classification: 52/187

(under subclass 182) Structure in which the stepped structure is arranged around a vertical center line.