4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover

Boris B. Danilov

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Annular air hammer apparatus for drilling wells

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Annular air-hammer apparatus for drilling holes

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Annular air-hammer apparatus for drilling holes

Boring or penetrating the earth – With below-ground tool drive prime mover
Patent

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Clamping attachment to a device for driving rod elements of low

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Patent

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Profile ID: LFUS-PAI-P-1207160

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