4. Wells
  5. With heating, refrigerating or heat insulating means
  6. Burner in well

William M. Kofahl

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Duplex hydraulic and air oil well pump

Pumps – Motor driven – Relatively movable pumping members driven by relatively...
Patent

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Hydrostatic and oil well pump

Pumps – Motor driven – Relatively movable pumping members driven by relatively...
Patent

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Jet engine pump and downhole heater

Wells – With heating – refrigerating or heat insulating means – Burner in well
Patent

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Jet engine pump and downhole heater

Wells – With eduction pump or plunger – Having sediment trap or deflector
Patent

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Pneumatically powered pump

Pumps – Motor driven – Fluid motor
Patent

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Profile ID: LFUS-PAI-P-1087155

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