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Efrain D. Vassallo

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  • Ponce, PR
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Patents Grantslast 30 patents

  • Information Patent Grant

    Pipe belling apparatus
    • Patent number 4,723,905
    • Issue date Feb 9, 1988
    • Vassallo Research and Development Corporation
    • Efrain D. Vassallo
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL