TREA

Martin E. Frenkel

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  • Round Lake Beach, IL, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Back-flow prevention valve
    • Patent number 4,366,834
    • Issue date Jan 4, 1983
    • Sargent-Welch Scientific Company
    • David E. Hanson
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...