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1536857
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Patent number 1,536,857
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Issue date May 5, 1925
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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1325898
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Patent number 1,325,898
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Issue date Dec 23, 1919
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL