US PATENT SUBCLASS 138 / 149
.~ With intermediate insulation layer

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

140  DF  DISTINCT LAYERS {8}
149.~ With intermediate insulation layer

DEFINITION

Classification: 138/149

(under subclass 140) Device wherein there is an intermediate layer of insulation material.