4. Boring or penetrating the earth
  5. With tool shaft detail
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Roof drilling system

Boring or penetrating the earth – With tool shaft detail
Patent

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Roof drilling system

Boring or penetrating the earth – With tool shaft detail
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Rotary drilling systems

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Rotary gad for ground drill

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Rotating drill pipe protector attachment and fastener assembly

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

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Rotating stabilizer for shaft drilling

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

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