4. Boring or penetrating the earth
  5. Cutter element laterally shiftable below ground
  6. Cutter element shifted by fluid pressure

Geir Tandberg

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Combination drill bit

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

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Combination drill bit

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

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Under-reaming tool for boreholes

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Patent

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Profile ID: LFUS-PAI-P-154228

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