TREA

Robert W. Spears, II

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  • Sylmar, CA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Check valve with pressure relief feature
    • Patent number 7,004,194
    • Issue date Feb 28, 2006
    • Spears Manufacturing Co.
    • Robert W. Spears, II
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...