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Marvin E. Holmgren

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  • Elkhart, IN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Method of making a pipe fitting and product
    • Patent number 4,047,412
    • Issue date Sep 13, 1977
    • Elkhart Products Corporation
    • Marvin E. Holmgren
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...