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Application filed by Jaroslav Obrtel, Ladislav Brazda, Josef KopecekfiledCriticalJaroslav Obrtel
Priority to CS875372ApriorityCriticalpatent/CS263033B1/en
Publication of CS537287A1publicationCriticalpatent/CS537287A1/en
Publication of CS263033B1publicationCriticalpatent/CS263033B1/en