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Priority claimed from DEP15462Aexternal-prioritypatent/DE965658C/de
Priority claimed from DEP16030Aexternal-prioritypatent/DE1108897B/de
Application filed by Papierfabrik Sundern G M B HfiledCriticalPapierfabrik Sundern G M B H
Publication of BE592023ApublicationCriticalpatent/BE592023A/fr