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Priority claimed from DE19782821612external-prioritypatent/DE2821612C3/de
Application filed by Rotring Werke Riepe KgfiledCriticalRotring Werke Riepe Kg
Publication of NO790427LpublicationCriticalpatent/NO790427L/no
Publication of NO150071BpublicationCriticalpatent/NO150071B/no
Publication of NO150071CpublicationCriticalpatent/NO150071C/no