US PATENT SUBCLASS 138 / 161
.~.~.~ Externally encircling

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}
161.~.~.~ Externally encircling

DEFINITION

Classification: 138/161

(under subclass 158) Device comprising an external element encircling or partially encircling the pipe.