US PATENT SUBCLASS 138 / 138
.~.~ With intermediate metal element

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

118  DF  FLEXIBLE {8}
137  DF  .~ Distinct layers {2}
138.~.~ With intermediate metal element

DEFINITION

Classification: 138/138

(under subclass 137) Device having a metallic element embedded in one of the layers or positioned between at least two layers.