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Backhead and drill assembly with backhead

Boring or penetrating the earth – Below-ground impact members
Reexamination Certificate

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Bedrock drilling and excavating apparatus

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Reexamination Certificate

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Bidirectional fluid operated vibratory jar

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Bit retention device for a bit and chuck assembly of a down-the-

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Bit retention device for a bit and chuck assembly of a down-the-

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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Bit retention system

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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Bit retention system

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Reexamination Certificate

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Bottom rotation shaft actuator

Boring or penetrating the earth – Below-ground impact members – Continuous unidirectional rotary motion of one telescoping...
Patent

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Bumping and jarring tool

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Cable overshot apparatus

Boring or penetrating the earth – Below-ground impact members
Patent

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Clutch for a jack element

Boring or penetrating the earth – Below-ground impact members
Reexamination Certificate

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Coil tubing hydraulic jar device

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Coil tubing hydraulic jar device

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Compensation device for insertion in a drill string for deep-wel

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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Compression shock absorber device

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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Control device

Boring or penetrating the earth – Below-ground impact members
Reexamination Certificate

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Converted dual-acting hydraulic drilling jar

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Converted dual-acting hydraulic drilling jar

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Coupling piece for use at simultaneous earth and/or rock drillin

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Derrick mounted apparatus for the manipulation of pipe

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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