4. Pumps
  5. Condition responsive control of pump drive motor
  6. By control of electric or magnetic drive motor

Ben B. Wolodko

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Method and apparatus for controlling downhole rotary pump used i

Pumps – Condition responsive control of pump drive motor – By control of electric or magnetic drive motor
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Sucker rod dimension measurement and flaw detection system

Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Reexamination Certificate

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Profile ID: LFUS-PAI-P-513241

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