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Donald S. Fiegen

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  • LaCrescent, MN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Method for pre-expanding heat exchanger tube
    • Patent number 4,498,220
    • Issue date Feb 12, 1985
    • The Trane Company
    • Donald S. Fiegen
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...