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US1720878A
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Method and mold for producing guiding, floating, and cementing shoes
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US1685307A
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Cementing and floating shoe
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US1720877A
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Rotary core barrel
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US1631509A
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Well-drill-pipe float coupling
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US1655644A
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Core retainer for core barrels
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US1636274A
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Counterbalance
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US1600864A
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Well-casing spider slip
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US1611504A
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Core barrel
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US1579975A
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Long-stroke lift for pumping wells
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US1600863A
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Well-casing spider slip
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US1561768A
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Cement basket
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US1517936A
|
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Elevator safety device
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US1559662A
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Casing-shoe guide
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US1562675A
|
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Coupling for well casings
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US1475531A
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Pitman end
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US1513083A
|
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Clean-out bailer
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US1508586A
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Floating plug for well casings
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US1497629A
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Bridge builder
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US1406329A
|
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Dump bailer
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US1424435A
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Pitman end
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