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Helical drill

Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Patent

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Helical stress relief groove apparatus and method for subterrane

Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Patent

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High bending strength ratio drill string components

Boring or penetrating the earth – With tool shaft detail
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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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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