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3706720
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Patent number 3,706,720
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Issue date Dec 19, 1972
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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3624060
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Patent number 3,624,060
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Issue date Nov 30, 1971
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...