US PATENT SUBCLASS 138 / 115
.~ Longitudinally extending common wall

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

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

DEFINITION

Classification: 138/115

(under subclass 111) Device having a longitudinally extending element therein which constitutes a common wall for more than one passageway.