4. Pumps
  5. Expansible chamber type
  6. Valved piston

Milton Skillman

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Bottom discharge valve

Pumps – Expansible chamber type – Fluid serially moved to opposite side of pumping member
Reexamination Certificate

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Downstroke sucker rod pump and method of use

Pumps – Expansible chamber type – Valved piston
Reexamination Certificate

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Insert rod guide

Wells – Guide for device or conduit – On sucker or pump rod
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2532904

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