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Priority claimed from DE1906209268Dexternal-prioritypatent/DE209268C/de
Priority claimed from DE1907216716Dexternal-prioritypatent/DE216716C/de
Application filed by Georges ImbertfiledCriticalGeorges Imbert
Application grantedgrantedCritical
Publication of AT49982BpublicationCriticalpatent/AT49982B/de