US PATENT SUBCLASS 52 / 653.2
.~.~.~ Having tubular member

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}
648.1  DF  .~ Three-dimensional space-defining {9}
653.1  DF  .~.~ Framework {1}
653.2.~.~.~ Having tubular member

DEFINITION

Classification: 52/653.2

Having tubular member:

(under subclass 653.1) Subject matter wherein the elongate members of the framework have a hollow cross-section.

(1) Note. Said cross-section of the member is usually, but not necessarily, circular in configuration.