US PATENT SUBCLASS 52 / 640
.~.~ With means to vary camber

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}
639  DF  .~ Curvilinear or peaked truss {5}
640.~.~ With means to vary camber

DEFINITION

Classification: 52/640

(under subclass 639) Structure provided with means to change the deflection or convexity of the peripheral member of the truss.

SEE OR SEARCH THIS CLASS, SUBCLASS:

632, for an axially extensible openwork.