TREA

Walter M. Rosin

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  • Grand Rapids, MI, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Trolley wheel
    • Patent number 4,019,789
    • Issue date Apr 26, 1977
    • C. L. Frost & Son, Inc.
    • Walter M. Rosin
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...