TREA

Edward G. Holtgraver

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  • Pittsburgh, PA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Tight shutoff butterfly valve
    • Patent number 4,148,458
    • Issue date Apr 10, 1979
    • Fisher Controls Company
    • Edward G. Holtgraver
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...