US PATENT SUBCLASS 138 / 122
.~.~ Spirally

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

118  DF  FLEXIBLE {8}
121  DF  .~ Corrugated {1}
122.~.~ Spirally

DEFINITION

Classification: 138/122

(under subclass 121) Device wherein the folds are found in the shape of a spiral or helix.