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Application filed by Josef Ing Csc Sovadina, Josef Ing Petrzelka, Stepita Matej, Frantisek Ing ValdstynfiledCriticalJosef Ing Csc Sovadina
Priority to CS862582ApriorityCriticalpatent/CS253648B1/cs
Publication of CS258286A1publicationCriticalpatent/CS258286A1/cs
Publication of CS253648B1publicationCriticalpatent/CS253648B1/cs