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Priority claimed from DER39196Aexternal-prioritypatent/DE1254893B/en
Application filed by Eduard RitterfiledCriticalEduard Ritter
Publication of DK135513BpublicationCriticalpatent/DK135513B/en
Application grantedgrantedCritical
Publication of DK135513CpublicationCriticalpatent/DK135513C/da