4. Boring or penetrating the earth
  5. With tool shaft detail
  6. Shaft carried guide or protector
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Fixed-contact stabilizer

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

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Friction reducing tool and method for its use in a wellbore

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

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Friction reducing tool for oilfield drilling applications

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

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Friction-reducing drill pipe component

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

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