US PATENT SUBCLASS 138 / 158
.~.~ With separate mechanical securing means

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

156  DF  LONGITUDINALLY SEAMED {8}
157  DF  .~ Sectional {3}
158.~.~ With separate mechanical securing means {2}
159  DF  .~.~.~> Bolt, nail, rivet or screw {1}
161  DF  .~.~.~> Externally encircling

DEFINITION

Classification: 138/158

(under subclass 157) Device wherein said longitudinal sections have distinct mechanical means, cooperating with the pipe wall, for securing said sections together.