4. Metal working
  5. Method of mechanical manufacture
  6. Prime mover or fluid pump making

Karlfried Preyer

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Method of making oil scraper piston rings

Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Reexamination Certificate

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Oil-scraper piston ring and a method for producing an...

Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2010536

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