US PATENT SUBCLASS 108 / 57.22
.~.~ Tubular or channel-shaped support members

Current as of: June, 1999
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108 /   HD   HORIZONTALLY SUPPORTED PLANAR SURFACES

51.11  DF  INDUSTRIAL PLATFORM {20}
57.21  DF  .~ Load-contacting surface having parallel support members in juxtaposed position {3}
57.22.~.~ Tubular or channel-shaped support members

DEFINITION

Classification: 108/57.22

Tubular or channel-shaped support members:

(under subclass 57.21) Device wherein the load-contacting elements each has an elongated hollow body or U-like cross section.