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

Fredrik Björk

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Percussion drill bit and a regrindable cemented carbide...

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

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Rock drill bit

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

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Rock drill bit having outer and inner rock-crushing buttons

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

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Profile ID: LFUS-PAI-P-2421429

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