TREA

David S. Grupenhagen

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  • Santa Ana, CA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Apparatus and method for spin forming a tube
    • Patent number 6,233,991
    • Issue date May 22, 2001
    • Bryant Products, Inc.
    • Frederick H. Thimmel
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...