US PATENT SUBCLASS 52 / 737.6
.~.~ Box-type, channel, or angle, cross-section

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

720.1  DF  SHAFT (I.E., ELONGATED RIGID STRUCTURE) {15}
737.1  DF  .~ Girder, column, etc. {4}
737.6.~.~ Box-type, channel, or angle, cross-section

DEFINITION

Classification: 52/737.6

Box-type, channel, or angle, cross-section:

(under subclass 737.1) Structure having a hollow or a C, U, or L shaped cross-section.