US PATENT SUBCLASS 138 / 131
.~.~ Metal core

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

118  DF  FLEXIBLE {8}
129  DF  .~ Spirally wound material {4}
131.~.~ Metal core

DEFINITION

Classification: 138/131

(under subclass 129) Device wherein the spirally wound

material constitutes a metallic core or innermost part of the pipe wall.