US PATENT SUBCLASS 138 / 168
.~ With interlocking hooks

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

156  DF  LONGITUDINALLY SEAMED {8}
168.~ With interlocking hooks

DEFINITION

Classification: 138/168

(under subclass 156) Device wherein the adjacent longitudinal edges of the pipe have hook-like formations which interlock to form a seam.