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1924617
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Patent number 1,924,617
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Issue date Aug 29, 1933
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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1869011
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Patent number 1,869,011
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Issue date Jul 26, 1932
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL