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3368915
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Patent number 3,368,915
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Issue date Feb 13, 1968
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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3323889
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Patent number 3,323,889
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Issue date Jun 6, 1967
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...