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3428600
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Patent number 3,428,600
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Issue date Feb 18, 1969
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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3141863
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Patent number 3,141,863
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Issue date Jul 21, 1964
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...