4. Boring or penetrating the earth
  5. With tool shaft detail
  6. Helix or helically arranged structure
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Anti-sticking tool for drill pipe

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

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Apparatus for reducing annular back pressure near the drill bit

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

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Apparatus for rock drill

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

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Auger

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

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Auger drilling system

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

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