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Application filed by Josef Ing Sunka, Frantisek Havlin, Jindrich ParfiledCriticalJosef Ing Sunka
Priority to CS86663ApriorityCriticalpatent/CS253548B1/en
Publication of CS66386A1publicationCriticalpatent/CS66386A1/en
Publication of CS253548B1publicationCriticalpatent/CS253548B1/en