4. Expansible chamber devices
  5. With lubricating means
  6. Piston has lubricant retaining or conducting means

Daryl I. Rober

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Closed cavity piston for hydrostatic power units and method...

Expansible chamber devices – With lubricating means – Piston has lubricant retaining or conducting means
Reexamination Certificate

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One piece slipper holddown device

Expansible chamber devices – Rotating cylinder – Plural cylinders
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2997309

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