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3637631
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Patent number 3,637,631
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Issue date Jan 25, 1972
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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3265678
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Patent number 3,265,678
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Issue date Aug 9, 1966
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...