US PATENT SUBCLASS 138 / 114
.~ Coaxial

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

111  DF  PLURAL DUCT {4}
114.~ Coaxial

DEFINITION

Classification: 138/114

(under subclass 111) Device wherein one duct lies coaxially within another duct.