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3542402
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Patent number 3,542,402
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Issue date Nov 24, 1970
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2961363
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Patent number 2,961,363
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Issue date Nov 22, 1960
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2930634
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Patent number 2,930,634
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Issue date Mar 29, 1960
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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1234431
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Patent number 1,234,431
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Issue date Jul 24, 1917
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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1163629
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Patent number 1,163,629
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Issue date Dec 7, 1915
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL