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3219596
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Patent number 3,219,596
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Issue date Nov 23, 1965
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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3055873
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Patent number 3,055,873
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Issue date Sep 25, 1962
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...