TREA

Donald O. Bartholomay

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  • Minneapolis, MN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Crosscut sampler with auger clean out
    • Patent number 4,587,858
    • Issue date May 13, 1986
    • Gustafson, Inc.
    • Donald O. Bartholomay
    • G01 - MEASURING TESTING
  • Information Patent Grant

    Automatic crosscut sampler
    • Patent number 4,389,906
    • Issue date Jun 28, 1983
    • Gustafson, Inc.
    • Donald O. Bartholomay
    • G01 - MEASURING TESTING