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

Josef Starkmann

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Boring tool

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

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Rock drill

Boring or penetrating the earth – Bit or bit element – With helical-conveying portion
Reexamination Certificate

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Rotary-percussion drill with a four-start helical shaft

Boring or penetrating the earth – Bit or bit element – With helical-conveying portion
Reexamination Certificate

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Profile ID: LFUS-PAI-P-191562

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