4. Boring or penetrating the earth
  5. Bit or bit element
  6. Nonsymmetrical bit

Hartmut Precht

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Drilling tool having a drill bit with primary and secondary cutt

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

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Rock drill

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

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Profile ID: LFUS-PAI-P-570689

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