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Priority claimed from DE3239535Aexternal-prioritypatent/DE3239535C2/en
Application filed by Heraeus ElektrodenfiledCriticalHeraeus Elektroden
Publication of NO842469LpublicationCriticalpatent/NO842469L/en
Publication of NO163334BpublicationCriticalpatent/NO163334B/en
Publication of NO163334CpublicationCriticalpatent/NO163334C/en