4. Tool driving or impacting
  5. Advance causing or controlling means
  6. Motor causes or controls advance
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Device in rock or earth drilling apparatus for rotary drilling

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Digger attachment

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Drill depth control device

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Reexamination Certificate

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Drill stem make-up and break-out system for earth drilling machi

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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