FLOW-REVERSING LINER SHOE FOR WELL GRAVEL PACKING APPARATUS
United States Patent 3421586

Inventors:
Solum, James R.
Publication Date:
01/14/1969
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Assignee:
B & W INC
Primary Class:
Other Classes:
166/205, 166/158
International Classes:
E21B43/04; E21B43/02; E21B43/04; E21B43/08




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