US PATENT SUBCLASS 52 / 176
.~.~ Central ramp group

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

174  DF  WITH TRAFFIC-GUIDING FEATURE {1}
175  DF  .~ Multilevel building with ramp {1}
176.~.~ Central ramp group

DEFINITION

Classification: 52/176

(under subclass 175) Structure wherein the inclined passageway means is positioned centrally of the building, usually forming a true helix or an interrupted helical core.