4. Rotary expansible chamber devices
  5. Unlike helical surfaces on relatively wobbling rotating...
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Wafer elements for progressing cavity stators

Rotary expansible chamber devices – Unlike helical surfaces on relatively wobbling rotating...
Patent

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Wafer elements for progressing cavity stators

Rotary expansible chamber devices – Unlike helical surfaces on relatively wobbling rotating...
Patent

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Working member of a helical downhole motor for drilling wells

Rotary expansible chamber devices – Unlike helical surfaces on relatively wobbling rotating...
Patent

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Worm for an eccentric screw pump or a subsurface drilling motor

Rotary expansible chamber devices – Unlike helical surfaces on relatively wobbling rotating...
Reexamination Certificate

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