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Application filed by Zdenek Ing Konecny, Jaroslav SmelikfiledCriticalZdenek Ing Konecny
Priority to CS872373ApriorityCriticalpatent/CS259988B1/en
Publication of CS237387A1publicationCriticalpatent/CS237387A1/en
Publication of CS259988B1publicationCriticalpatent/CS259988B1/en