Bayer and Co.
Patent: DE86150 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 4, p. 308
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Bayer and Co.
Patent: DE86539 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 4, p. 312
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Bayer and Co.
Patent: DE114199 ;