US PATENT SUBCLASS 138 / 117
.~.~ Complementary sections

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

111  DF  PLURAL DUCT {4}
115  DF  .~ Longitudinally extending common wall {2}
117.~.~ Complementary sections

DEFINITION

Classification: 138/117

(under subclass 115) Device comprising complementary sections, at least one of the sections having the common wall integral therewith.