original Patent - Dr. Max Klett , Dr. Rudolf Speidel , Danzig / Langfuhr | 1898 | Glanz an schwarzer Gelatine erhalten

Published by Patentinhaber: Dr. Max Klett , Dr. Rudolf Speidel , Danzig / LangfuhrPatent: Verfahren zur Erhaltung des Glanzes schwarzer GelatinekörperPatentiert am: 20.11.1898P-459
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