4. Boring or penetrating the earth
  5. With tool shaft detail
  6. Helix or helically arranged structure
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Flexible drill string member especially for use in directional d

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

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Footing auger

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

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Free flow stabilizer

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

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Frictional vibration damper for downhole tools

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

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