TREA

Donald E. Carlson

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  • Highland Park, IL, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Check valve
    • Patent number 4,368,756
    • Issue date Jan 18, 1983
    • Mark Controls Corporation
    • Donald E. Carlson
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Frostproof backflow preventer
    • Patent number 4,117,856
    • Issue date Oct 3, 1978
    • Mark Controls Corporation
    • Donald E. Carlson
    • E03 - WATER SUPPLY SEWERAGE
  • Information Patent Grant

    Ejector purge hydrant
    • Patent number 4,112,966
    • Issue date Sep 12, 1978
    • Mark Controls Corporation
    • Donald E. Carlson
    • E03 - WATER SUPPLY SEWERAGE