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US3684008A
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Well bore blocking means and method
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US3496953A
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Gas lift valve mandrel for well pipe strings
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US3454093A
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Rotating gas lift mandrel for well pipe strings
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US3454096A
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Crossover device for parallel pipe strings
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US3342269A
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Anchor for a well tool
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US3410346A
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Well apparatus
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US3318322A
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Pressure responsive gas lift valve
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US2947518A
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Side wall core taking apparatus
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US2951536A
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Method and apparatus for remote control of valves or the like
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US2552892A
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Pressure responsive valve
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CA779734A
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Well apparatus
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CA669263A
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Well apparatus
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CA807466A
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Method and apparatus for installing and removing gas lift valves in a well
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