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John R. Graber, Jr.

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  • Murrysville, PA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Multi-stage helical screw rotor
    • Patent number 7,074,026
    • Issue date Jul 11, 2006
    • Leybold Vakuum GmbH
    • John R. Graber, Jr.
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...