4. Boring or penetrating the earth
  5. Bit or bit element
  6. Nonsymmetrical bit
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Anti-whirl drill bit

Boring or penetrating the earth – Bit or bit element – Nonsymmetrical bit
Patent

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Anti-whirl drill bit

Boring or penetrating the earth – Bit or bit element – Nonsymmetrical bit
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Apparatus for drilling holes in mine roofs and a roof drill bit

Boring or penetrating the earth – Bit or bit element – Nonsymmetrical bit
Patent

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Arrangement of roller cone inserts

Boring or penetrating the earth – Bit or bit element – Nonsymmetrical bit
Reexamination Certificate

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Asymmetric diamond impregnated drill bit

Boring or penetrating the earth – Bit or bit element – Nonsymmetrical bit
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0
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