US PATENT SUBCLASS 138 / 135
.~.~.~ With interlocked or clamped edge
Current as of:
June, 1999
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138 /
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PIPES AND TUBULAR CONDUITS
118
DF
FLEXIBLE
{8}
129
DF
.~ Spirally wound material {4}
134
DF
.~.~ Metal {1}
135
.~.~.~ With interlocked or clamped edge {1}
136
DF
.~.~.~.~
> Packed or sealed
DEFINITION
Classification: 138/135
(under subclass 134) Device wherein a spiral edge is interlocked with an adjacent spiral edge.