4. Boring or penetrating the earth
  5. With tool shaft detail
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Non-rotatable stabilizer and torque reducer

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

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Non-rotating spring loaded stabilizer

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

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Non-rotating stabilizer and centralizer for well drilling operat

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

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