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3898192
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Patent number 3,898,192
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Issue date Aug 5, 1975
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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3892718
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Patent number 3,892,718
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Issue date Jul 1, 1975
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...