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.