4. Rotary expansible chamber devices
  5. With supply or exhaust passage in working member
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Downhole roller vane motor

Rotary expansible chamber devices – With supply or exhaust passage in working member – Supply or exhaust passage through working member center of...
Reexamination Certificate

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Downhole roller vane motor and roller vane pump

Rotary expansible chamber devices – With supply or exhaust passage in working member – Passage includes vane slot
Reexamination Certificate

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Downhole roller vane motor and roller vane pump

Rotary expansible chamber devices – With supply or exhaust passage in working member – Supply or exhaust passage through working member center of...
Patent

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