US PATENT SUBCLASS 138 / 175
.~.~ Clay, concrete or masonry

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

172  DF  REINFORCED {2}
174  DF  .~ With embedded element {1}
175.~.~ Clay, concrete or masonry {1}
176  DF  .~.~.~> Reinforcement under tension

DEFINITION

Classification: 138/175

(under subclass 174) Device wherein said wall is clay, concrete or masonry.

SEE OR SEARCH CLASS

264, Plastic and Nonmetallic Article Shaping or Treating: Processes, particularly

30, 31+, 228, and 603+.