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Application filed by Charles Edward HopkinsfiledCriticalCharles Edward Hopkins
Priority to AT67280DpriorityCriticalpatent/AT67280B/de
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Publication of AT67280BpublicationCriticalpatent/AT67280B/de
Retouchierverfahren für photographische Positivbilder, die zur Herstellung von Negativen für die Erzielung richtiger Reliefs nach dem Quellverfahren dienen.