US PATENT SUBCLASS 138 / 130
.~.~ Oppositely wound


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}
130.~.~ Oppositely wound


DEFINITION

Classification: 138/130

(under subclass 129) Device wherein there are plural layers of material spirally wound in opposite directions.