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CA1127075A
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Tubing drain
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US3333639A
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Parallel string installation for single-zone production
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US3156300A
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Method and apparatus for protecting wells
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US3102495A
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Casing pump
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US2918249A
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Fluid pressure actuated control valve
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US2996074A
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Fluid pressure actuated shut-off valve
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US2799348A
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Well cementing apparatus
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US2777522A
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Tubing anchor
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US2764244A
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Well tool
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US2764243A
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Well packer
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US2619120A
|
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Fluid pressure actuated valve
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US2693201A
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Valve
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US2625172A
|
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Flow controlling device
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US2435899A
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Tubing anchor
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US2332748A
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Combination rod safety joint and tubing drain
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US2297020A
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Circulating fluid washer
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US2280769A
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Casing cutter
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US2229986A
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Automatic pump control
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CA594184A
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Fluid pressure actuated control valve
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