4. Tool driving or impacting
  5. Hammer or tool shaft reciprocated by gripping means which...
  6. With fixed means cyclically contacted by grip structure
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Air pressure impact drilling method and apparatus for same

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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Apparatus for supporting and rotating a down hole tubular

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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