4. Boring or penetrating the earth
  5. With tool shaft detail
  6. Axially telescoping shaft section

Urban Olsson

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Method, drilling tool and rock drill bit for transferring impact

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Rock drill bit and a check valve therefor

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate

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Thread joint

Boring or penetrating the earth – Below-ground impact members
Reexamination Certificate

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Thread joint percussive drilling equipment

Boring or penetrating the earth – With tool shaft detail
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1608042

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