US PATENT SUBCLASS 138 / 160
.~.~.~.~ Radially extending

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  DF  .~.~ With separate mechanical securing means {2}
159  DF  .~.~.~ Bolt, nail, rivet or screw {1}
160.~.~.~.~ Radially extending

DEFINITION

Classification: 138/160

(under subclass 159) Device extending radially through the pipe wall.