Gilbert Berthereau

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Eybens, FR

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Patents Grantslast 30 patents

Information Patent Grant
Pump impeller seals with spiral grooves
- Patent number 4,242,039
- Issue date Dec 30, 1980
- L'Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Ge...
- Jean-Claude Villard
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...