US PATENT SUBCLASS 138 / 163
.~.~ Bent over lip or flange

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

156  DF  LONGITUDINALLY SEAMED {8}
157  DF  .~ Sectional {3}
163.~.~ Bent over lip or flange

DEFINITION

Classification: 138/163

(under subclass 157) Device wherein at least one of said longitudinal sections has a bent over lip or flange.