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Application filed by Jan Vokal, Nakladal Leos, Vera SlesingerovafiledCriticalJan Vokal
Priority to CS864988ApriorityCriticalpatent/CS253995B1/en
Publication of CS498886A1publicationCriticalpatent/CS498886A1/en
Publication of CS253995B1publicationCriticalpatent/CS253995B1/en