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US1839861A
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Cementing plug
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US1748007A
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Guiding, floating, and cementing device for well casings
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US1823312A
|
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Cementing and floating device for well casings
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US1756504A
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Wrist pin
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US1994846A
|
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Combined shoe guide and bull plug for well casings
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US1718771A
|
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Fishing apparatus for deep wells
|
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US1770601A
|
|
Counterbalance
|
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US1359017A
|
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Shoe-guide for well-casings
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US1203300A
|
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Safety-clutch for elevators.
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US1140789A
|
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Anchor for well-tubing.
|
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US1101234A
|
|
Pump-plunger.
|
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US1155539A
|
|
Calf and bull wheel bearing.
|
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US1037850A
|
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Packer for oil or artesian wells.
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US1035674A
|
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Cement-retainer.
|
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US1078895A
|
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Plug for well-casings.
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US1023292A
|
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Anchor for well-tubing.
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US896967A
|
|
Gas-trap for oil-wells.
|
|
US860115A
|
|
Well-casing shoe.
|
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CA91972A
|
|
Drilling bit
|
|
US747575A
|
|
Drilling-bit.
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