US PATENT SUBCLASS 138 / 143
.~.~ Metal

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

140  DF  DISTINCT LAYERS {8}
141  DF  .~ Bonded to each other {3}
143.~.~ Metal

DEFINITION

Classification: 138/143

(under subclass 141) Device wherein at least one of the contacting layers is metal.