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Publication date
Application filed by Frantisek Zverina, Jiri VitfiledCriticalFrantisek Zverina
Priority to CS862499ApriorityCriticalpatent/CS264768B1/en
Publication of CS249986A1publicationCriticalpatent/CS249986A1/en
Publication of CS264768B1publicationCriticalpatent/CS264768B1/en