4. Rotary expansible chamber devices
  5. Heat exchange or non-working fluid lubricating or sealing
  6. With coolant air impelling means or finned cylinder surface

Ulrich Helbing

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Apparatus and method for injecting a liquid dye into a...

Agitating – Rubber or heavy plastic working – With specified feed means
Reexamination Certificate

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Spin pump having a cooling sleeve surrounding the drive shaft

Rotary expansible chamber devices – Heat exchange or non-working fluid lubricating or sealing – With coolant air impelling means or finned cylinder surface
Reexamination Certificate

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