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Group Four Design

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  • Avon, CT, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Document shredding machine and method
    • Patent number 4,997,134
    • Issue date Mar 5, 1991
    • Group Four Design
    • Francis W. MacGregor
    • B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...