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2168127
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Patent number 2,168,127
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Issue date Aug 1, 1939
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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2105669
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Patent number 2,105,669
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Issue date Jan 18, 1938
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...