4. Wells
  5. Automatic

Donald J. Barrus

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High pressure automatic kelly valve

Wells – Automatic
Patent

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High pressure automatic mud saver valve

Wells – Automatic
Patent

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Progressive cavity pump with flexible coupling

Pumps – Motor driven – Electric or magnetic motor
Patent

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Progressive cavity pump with flexible coupling

Pumps – Motor driven – Electric or magnetic motor
Reissue Patent

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Profile ID: LFUS-PAI-P-981219

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