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US2336090A
|
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Fluid retaining cup
|
|
US2404876A
|
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Oil well tool
|
|
US2402886A
|
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Oil well device
|
|
US2308072A
|
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Method of cementing oil wells
|
|
US2326940A
|
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Oil well tool
|
|
US2291892A
|
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Fluid retaining cup
|
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US2248169A
|
|
Oil well tool
|
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US1840944A
|
|
Means for draining liquid from well tubing
|
|
US1793793A
|
|
Deep-well fluid-actuated pump
|
|
US1826210A
|
|
Means for draining liquid from well tubing
|
|
US1812945A
|
|
Means for locating and cementing off leaks in well casings
|
|
US1750886A
|
|
Packing
|
|
US1812944A
|
|
Means for indicating and cementing off leaks in well casings
|
|
US1758153A
|
|
Means for pumping liquid
|
|
US1812943A
|
|
Means for locating leaks in well tubing
|
|
US1839844A
|
|
Drill pipe and propeller shaft
|
|
US1821212A
|
|
Impact bit
|
|
US1718416A
|
|
Leak indicator and cementing plug
|
|
US1744698A
|
|
Means for locating, testing, and cleaning leaks or holes in well casings
|
|
US1796454A
|
|
Apparatus for locating leaks
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