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David J. Opal

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  • Lebanon, CT, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Mainspring decoiler and method
    • Patent number 5,816,524
    • Issue date Oct 6, 1998
    • David J. Opal
    • B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS