TREA

Donell P. Froehlich

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  • Brookings, SD, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Skid-steer vehicle
    • Patent number 4,705,449
    • Issue date Nov 10, 1987
    • Leslie L. Christianson
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Grant

    Electric tractor
    • Patent number 4,662,472
    • Issue date May 5, 1987
    • Leslie L. Christianson
    • B60 - VEHICLES IN GENERAL