4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. Below-ground storage of motivating energy

Nils Inge Nilsen

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Pressure converter

Boring or penetrating the earth – With below-ground tool drive prime mover – Below-ground storage of motivating energy
Patent

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Pressure converter

Tool driving or impacting – Impacting devices – Hammer head constitutes piston of drive motor
Patent

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Pressure converter III

Tool driving or impacting – Impacting devices – Hammer head constitutes piston of drive motor
Patent

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Profile ID: LFUS-PAI-P-1243189

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