4. Tool driving or impacting
  5. Means to drive tool about an axis
  6. Means to hold and relatively rotate sections of tool shaft
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Drill rod opening device for sectional-rod drilling equipment

Tool driving or impacting – Means to drive tool about an axis – Means to hold and relatively rotate sections of tool shaft
Patent

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Drill stem for drilling upwardly

Tool driving or impacting – Means to drive tool about an axis – Means to hold and relatively rotate sections of tool shaft
Patent

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Drill string element

Tool driving or impacting – Means to drive tool about an axis – Means to hold and relatively rotate sections of tool shaft
Patent

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Drive connector with load compensator

Tool driving or impacting – Means to drive tool about an axis – Means to hold and relatively rotate sections of tool shaft
Patent

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