4. Wells
  5. With electrical means
  6. Valve
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Actuating device

Wells – With electrical means – Valve
Reexamination Certificate

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Apparatus for downhole injection and mixing of fluids into a cem

Wells – With electrical means – Valve
Patent

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Apparatus for monitoring a parameter in a well

Wells – With electrical means – Valve
Patent

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Apparatus for positioning a working implement in a borehole

Wells – With electrical means – Valve
Patent

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Apparatus for testing earth formations

Wells – With electrical means – Valve
Patent

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Apparatus to increase oil well flow

Wells – With electrical means – Valve
Patent

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