4. Boring or penetrating the earth
  5. Bit or bit element
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Kerf-cutting apparatus and method for improved drilling rates

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent

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Kerf-cutting apparatus for increased drilling rates

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Keyed connection for drill bit

Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Keyed connection for drill bit

Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Keyseat wiper

Boring or penetrating the earth – Bit or bit element – Noncutting portion forwardly of cutting portion
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0
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