Hynson,Westcott and Danning Inc.
Patent: US2161358 , 1938 ;

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Forman; Carr; Krantz
Journal of the American Pharmaceutical Association (1912-1977), 1941 , vol. 30, p. 133
Chem.Abstr., 1941 , p. 6235

Uniroyal, Inc.
Patent: US4528381 A1, 1985 ;