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3475229
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Patent number 3,475,229
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Issue date Oct 28, 1969
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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3100910
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Patent number 3,100,910
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Issue date Aug 20, 1963
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2892733
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Patent number 2,892,733
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Issue date Jun 30, 1959
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL