TREA

Gregory R. Johnson

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  • Nisswa, MN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Dash mounted sonar depth indicator
    • Patent number D400450
    • Issue date Nov 3, 1998
    • MarCum Enterprises, Inc.
    • Duane E. Cummings
    • D10 - Measuring, testing, or signalling instruments
  • Information Patent Grant

    Gimbal mounted sonar depth indicator
    • Patent number D394405
    • Issue date May 19, 1998
    • MarCum Enterprises, Inc.
    • Duane E. Cummings
    • D10 - Measuring, testing, or signalling instruments