US PATENT SUBCLASS 138 / 169
.~ Diversity of seam

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

156  DF  LONGITUDINALLY SEAMED {8}
169.~ Diversity of seam

DEFINITION

Classification: 138/169

(under subclass 156) Device wherein the seam forming structure changes its character somewhere along the length of the seam.