US PATENT SUBCLASS 138 / 177
STRUCTURE

Current as of: June, 1999
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138 /   HD   PIPES AND TUBULAR CONDUITS

177STRUCTURE

DEFINITION

Classification: 138/177

(under the class definition) Subject matter relating to the make-up of the pipe wall and not otherwise classifiable.

SEE OR SEARCH CLASS

106, Compositions: Coating or Plastic, appropriate subclasses for the composition of plastic pipe.

420, Alloys or Metallic Compositions, appropriate subclasses for the composition of metal pipe.