TREA

Derrick L. Heyl

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  • Rolling Stone, MN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Valve grinder
    • Patent number 5,337,521
    • Issue date Aug 16, 1994
    • Hein-Werner Corporation
    • Derrick Heyl
    • B24 - GRINDING POLISHING
  • Information Patent Grant

    Cleaning machine
    • Patent number 4,383,542
    • Issue date May 17, 1983
    • Winona Tool Manufacturing Company
    • Wayne H. Hanson
    • B08 - CLEANING