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Application filed by Karel Ing Krivsky, Vladimir Ing BorovecfiledCriticalKarel Ing Krivsky
Priority to CS873490ApriorityCriticalpatent/CS268256B1/en
Publication of CS349087A1publicationCriticalpatent/CS349087A1/en
Publication of CS268256B1publicationCriticalpatent/CS268256B1/en