4. Boring or penetrating the earth
  5. With tool shaft detail
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Earth displacement drill

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

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Earth-boring tools having threads for affixing a body and...

Boring or penetrating the earth – With tool shaft detail
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Electrically insulating gap subassembly for downhole electromagn

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

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Electrically insulating gap subassembly for downhole...

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

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Element of a rotating drill pipe string

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

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Equipment to reduce torque on a drill string

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

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Expandable milling head for gas well drilling

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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