US PATENT SUBCLASS 138 / 101
.~ Distinct layers

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

100  DF  BREAKJOINT {2}
101.~ Distinct layers

DEFINITION

Classification: 138/101

(under subclass 100) Device wherein the pipe wall comprises more than one layer, one layer having transverse joints that break joint relative to transverse joints of another layer.