US PATENT SUBCLASS 166 / 89.2
.~.~.~ Parallel pipes (as opposed to concentric)

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  DF  .~.~ Plural inner pipes {2}
89.2.~.~.~ Parallel pipes (as opposed to concentric)

DEFINITION

Classification: 166/89.2

Parallel pipes (as opposed to concentric):

(under subclass 89.1) Plural inner pipes anchor with lateral port wherein the conveying lines are coaxial and side by side.