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Application filed by Zdenek Ing Zahradnik, Karel Ing Csc Friedmann, Jan Ing HorskyfiledCriticalZdenek Ing Zahradnik
Priority to CS872474ApriorityCriticalpatent/CS268098B1/cs
Publication of CS247487A1publicationCriticalpatent/CS247487A1/cs
Publication of CS268098B1publicationCriticalpatent/CS268098B1/cs