US PATENT SUBCLASS 138 / 171
.~.~ Brazed, soldered or welded

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

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

DEFINITION

Classification: 138/171

(under subclass 170) Device wherein the forming or locking means is a braze, solder or weld.

SEE OR SEARCH THIS CLASS, SUBCLASS:

144, for brazed, soldered or welded distinct layer pipe.