4. Tool driving or impacting
  5. Automatic control of power operated means
  6. Tool advance causing or controlling means
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Well rig

Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent

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Well rig lift system and a hydraulic energy-storing well rig lif

Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent

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