US PATENT SUBCLASS 166 / 89.1
.~.~ Plural inner pipes

Current as of: June, 1999
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166 /   HD   WELLS

75.11  DF  ABOVE GROUND APPARATUS {25}
88.1  DF  .~ Inner member anchor or seal with lateral port {3}
89.1.~.~ Plural inner pipes {2}
89.2  DF  .~.~.~> Parallel pipes (as opposed to concentric)
89.3  DF  .~.~.~> Having slip type hanger

DEFINITION

Classification: 166/89.1

Plural inner pipes:

(under subclass 88.1) Inner member anchor with lateral port in which there are at least two conveying lines within the outermost casing.