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John L. Sipsma

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  • Wyoming, MI, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Method for making a magnetic shield
    • Patent number 4,792,317
    • Issue date Dec 20, 1988
    • Center Manufacturing Inc.
    • John L. Sipsma
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...