4. Boring or penetrating the earth
  5. Bit or bit element
  6. Specific or diverse material

John (Youhe) Zhang

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High-strength/high toughness alloy steel drill bit blank

Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate

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High-strength/high toughness alloy steel drill bit blank

Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

High-strength/high-toughness alloy steel drill bit blank

Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate

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Stress relief feature on PDC cutter

Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2360238

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