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Friedhelm Keller

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  • Donaueschingen, DE
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Patents Grantslast 30 patents

  • Information Patent Grant

    Welding sleeve and method for its manufacture
    • Patent number 5,255,943
    • Issue date Oct 26, 1993
    • Georg Fischer Rohrleitungssysteme AG
    • Friedhelm Keller
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL