4. Tool driving or impacting
  5. Impacting devices
  6. Hammer head constitutes piston of drive motor
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Impact applying mechanism

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

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Impact drilling tool having a shuttle valve

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

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Impact hammer

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

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Impact tool

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

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Improved downhole hammer

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

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