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Duct forming machine
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Patent number 5,186,704
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Issue date Feb 16, 1993
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Glass Master Corporation
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Robert A. Cunningham
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B31 - MAKING ARTICLES OF PAPER OR CARDBOARD WORKING PAPER OR CARDBOARD
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3313666
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Patent number 3,313,666
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Issue date Apr 11, 1967
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3213890
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Patent number 3,213,890
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Issue date Oct 26, 1965
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL