US PATENT SUBCLASS 166 / 66.7
.~.~ Longitudinally movable operator

Current as of: June, 1999
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166 /   HD   WELLS

65.1  DF  WITH ELECTRICAL MEANS {4}
66.6  DF  .~ Valve {1}
66.7.~.~ Longitudinally movable operator

DEFINITION

Classification: 166/66.7

Longitudinally movable operator:

(under subclass 66.6) Valve with electrical means in which the flow regulator is opened, closed, or adjusted by an element shifted parallel to the well pipe or casing.