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Priority claimed from DE3420693Aexternal-prioritypatent/DE3420693A1/en
Application filed by Johann BergerfiledCriticalJohann Berger
Priority to CS874437ApriorityCriticalpatent/CS266344B2/en
Publication of CS443787A2publicationCriticalpatent/CS443787A2/en
Publication of CS266344B2publicationCriticalpatent/CS266344B2/en