TREA

Douglas A. Covert

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  • Painesville, OH, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Valve stem packing system
    • Patent number 5,263,682
    • Issue date Nov 23, 1993
    • Whitey Co.
    • Douglas A. Covert
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...