Chininfabr. Zimmer and Co.
Patent: DE91370 ;
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v. Noorden
Chem. Zentralbl., 1897 , vol. 68, # I p. 182

Chininfabr. Zimmer and Co.
Patent: DE178172 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 8, p. 1178,1179
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Chininfabr. Zimmer and Co.
Patent: DE178173 ;

Chininfabr. Zimmer and Co.
Patent: DE128116 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 6, p. 1131