4. Boring or penetrating the earth
  5. Bit or bit element
  6. Impact or percussion type

Debkumar Mukhopadhyay

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Polycrystalline diamond compact including a cemented...

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

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Rotary drill bit including polycrystalline diamond cutting...

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

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Profile ID: LFUS-PAI-P-2252349

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