TREA

Ralph L. Hart

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  • Madison, OH, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Valve and tapping tee apparatus and method
    • Patent number 4,809,735
    • Issue date Mar 7, 1989
    • Perfection Corporation
    • Frank R. Volgstadt
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Valve and tapping tee apparatus and method
    • Patent number 4,730,636
    • Issue date Mar 15, 1988
    • Perfection Corporation
    • Frank R. Volgstadt
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...