4. Boring or penetrating the earth
  5. With tool shaft detail
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Variable depth grooved drill string member

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Variable diameter drill rod stabilizer

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Variable gauge drilling apparatus and method of assembly...

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Vertical drilling system for controlling deviation

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Vibration damping tool

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0
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