Original Patent - Dr. Hugo Engelsing in Witten a. d. Ruhr , 1883 , Darstellung von Farbstoffen !!!

Published by Patentinhaber: Dr. Hugo Engelsing in Witten a. d.RuhrPatent: Verfahren zur Darstellung vonFarbstoffenPatentiert am: 25.08.1883K-28
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