US PATENT SUBCLASS 138 / 119
.~ With means for facilitating collapse

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

118  DF  FLEXIBLE {8}
119.~ With means for facilitating collapse

DEFINITION

Classification: 138/119

(under subclass 118) Device having a crease or other means in the pipe wall for facilitating collapsing of the pipe.