TREA

Henry Gruchalski

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  • Chicago, IL, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Piercing die
    • Patent number 4,802,393
    • Issue date Feb 7, 1989
    • Ecological Systems, Inc.
    • Henry Gruchalski
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    Vertical pierce die
    • Patent number 4,621,553
    • Issue date Nov 11, 1986
    • Henry Gruchalski
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...