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

John Herke

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Well drilling bit

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

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Well drilling bit dressing apparatus and method

Metal tools and implements – making – Machines – Drill-forming or sharpening
Patent

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Profile ID: LFUS-PAI-P-594833

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