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3218279
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Patent number 3,218,279
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Issue date Nov 16, 1965
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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3214400
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Patent number 3,214,400
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Issue date Oct 26, 1965
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...