4. Tool driving or impacting
  5. Work cleansing
  6. By motive fluid for drive motor or advance causing or...
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Down-hole mud actuated hammer

Tool driving or impacting – Work cleansing – By motive fluid for drive motor or advance causing or...
Patent

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Down-the-hole percussion drills

Tool driving or impacting – Work cleansing – By motive fluid for drive motor or advance causing or...
Patent

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Drilling assembly for percussion drilling of deep wells

Tool driving or impacting – Work cleansing – By motive fluid for drive motor or advance causing or...
Patent

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