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Priority claimed from DE1575149Aexternal-prioritypatent/DE1575149C3/de
Priority to AT71968ApriorityCriticalpatent/AT295249B/de
Application filed by Hilti AgfiledCriticalHilti Ag
Priority to AT298570Aprioritypatent/AT310507B/de
Application grantedgrantedCritical
Publication of AT310507BpublicationCriticalpatent/AT310507B/de