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US3746405A
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Well drilling bit lubrication and seal
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US3179189A
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Bit for drilling wells
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US3151691A
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Rock bit bearing seal
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US3120284A
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Jet nozzle for drill bit
|
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US2960313A
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Drill bit construction having means for preventing mud-cutting
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US2805045A
|
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Well drilling bit
|
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US2778669A
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Magnetic fishing tool
|
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US2556531A
|
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Mechanism for the control and operation of a gate
|
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US2633825A
|
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Quick-acting race control gate
|
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US2470695A
|
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Cone type well drilling bit
|
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US2461780A
|
|
Starting gate
|
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US2482263A
|
|
Roller bit
|
|
US2562346A
|
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Drilling tool
|
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US2471616A
|
|
Core catcher
|
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US2471661A
|
|
Apparatus for mounting work in a holder
|
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US2463065A
|
|
Method for mounting work in a holder
|
|
US2463064A
|
|
Work handling device
|
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US2248340A
|
|
Rock bit
|
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US2230569A
|
|
Roller cutter
|
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US2258352A
|
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Core drill
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