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3774051
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Patent number 3,774,051
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Issue date Nov 20, 1973
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3766550
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Patent number 3,766,550
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Issue date Oct 16, 1973
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3621519
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Patent number 3,621,519
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Issue date Nov 23, 1971
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL