US PATENT SUBCLASS 138 / 170
.~ Permanent type seam

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

156  DF  LONGITUDINALLY SEAMED {8}
170.~ Permanent type seam {1}
171  DF  .~.~> Brazed, soldered or welded

DEFINITION

Classification: 138/170

(under subclass 156) Device wherein the seam is permanently formed or locked.