4. Tool driving or impacting
  5. Impacting devices
  6. Selective axial direction of impact
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Back end connection in a downhole drill

Tool driving or impacting – Impacting devices – Selective axial direction of impact
Patent

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Bidirectional hydraulic jar

Tool driving or impacting – Impacting devices – Selective axial direction of impact
Patent

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Bit striking apparatus for use in an excavator

Tool driving or impacting – Impacting devices – Selective axial direction of impact
Reexamination Certificate

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