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3655499
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Patent number 3,655,499
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Issue date Apr 11, 1972
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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2762735
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Patent number 2,762,735
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Issue date Sep 11, 1956
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...