Novocol Chem.Mfg.Co.
Patent: US2363083 , 1943 ;

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Novocol Chem.Mfg.Co.
Patent: US2363082 , 1943 ;

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Novocol Chem.Mfg.Co.
Patent: US2363081 , 1941 ;

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Ringk; Epstein
Journal of the American Chemical Society, 1943 , vol. 65, p. 1222,1223

Mizzy Inc.
Patent: US2767207 , 1953 ;