4. Motors: expansible chamber type
  5. Cyclically operable

Ethridge F. Ogles

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Centrifugal pump

Rotary kinetic fluid motors or pumps – Including heat insulation or exchange means – Cooling fluid contacts shaft – seal or bearing
Patent

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Hydraulically operated oil well pump jack

Motors: expansible chamber type – Cyclically operable
Patent

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Hydraulically operated pump jack with holding valves and control

Motors: expansible chamber type – Relatively movable working members with one having motive... – Single valve unit controlling plural working chambers
Patent

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Oil well pump jack with dual hydraulic operating cylinders

Motors: expansible chamber type – Cyclically operable
Patent

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