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Drilling string shock-absorbing tool

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Drilling string shock-absorbing tool

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Expandable milling head for gas well drilling

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Fluid controlled adjustable down-hole tool

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Reexamination Certificate

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High-load hydraulic disconnect

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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High-load hydraulic disconnect

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Hydraulic shock absorber

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Hydraulic shock absorber

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Hydraulic shock absorber with nitrogen stabilizer

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Joint device in extension drill equipment for percussive drillin

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Locking swivel apparatus with a supplemental internal...

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Reexamination Certificate

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Mechanical drilling jar

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Mechanical locking swivel apparatus

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Method, drilling tool and rock drill bit for transferring impact

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Pressure compensated weight on bit shock sub for a wellbore dril

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Reciprocating drill bit

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Releasing tool

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Roller Belleville spring damper

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Roof drill and drill rod system

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Shear sub for drill string

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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