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3894973
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Patent number 3,894,973
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Issue date Jul 15, 1975
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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2147293
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Patent number 2,147,293
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Issue date Feb 14, 1939
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D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...