Organic pigments from twisted benzidines

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Title: Organic pigments from twisted benzidines
Date: 1999
Citation: Freeman, H. S., Hinks, D., & Sokolowska-Gajda, J. (1999). Organic pigments from twisted benzidines. U.S. Patent No. 5,965,717. Washington, DC: U.S. Patent and Trademark Office.
URI: http://www.lib.ncsu.edu/resolver/1840.2/828


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