Cassella and Co.
Patent: DE112098 ;

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Cassella and Co.
Patent: DE110618 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 5, p. 520,935
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Friedlaender; Silberstern
Monatshefte fuer Chemie, 1902 , vol. 23, p. 532
Chem. Zentralbl., 1902 , vol. 73, # I p. 934