Bayer and Co.
Patent: DE205881 ;

Bayer and Co.
Patent: DE127458 ;

Bayer and Co.
Patent: DE205881 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 9, p. 716
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Bayer and Co
Chem. Zentralbl., 1909 , vol. 80, # I p. 881
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Bayer and Co.
Patent: DE205881 ;