US PATENT SUBCLASS 52 / 646
.~.~ Three-dimensional space-defining

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

633  DF  OPENWORK; E.G., TRUSS, TRELLIS, GRILLE, SCREEN, FRAME, OR REBAR CHAIR {12}
645  DF  .~ Components adjustably or collapsibly connected {1}
646.~.~ Three-dimensional space-defining

DEFINITION

Classification: 52/646

(under subclass 645) Structure in which the three or more planes defined by corner chords of the collapsible openwork define a three-dimensional space.

SEE OR SEARCH THIS CLASS, SUBCLASS:

637, 643, and 648.1+, for another three-dimensional openwork structure.