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2025993
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Patent number 2,025,993
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Issue date Dec 31, 1935
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Patent number 1,798,210
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Issue date Mar 31, 1931
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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1734766
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Patent number 1,734,766
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Issue date Nov 5, 1929
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL