4. Boring or penetrating the earth
  5. With tool shaft detail
  6. Shaft carried guide or protector
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Variable diameter drill rod stabilizer

Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Patent

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Variable gauge drilling apparatus and method of assembly...

Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Reexamination Certificate

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Vertical drilling system for controlling deviation

Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Reexamination Certificate

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