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Application filed by Karel Mudr Stein, Frantisek Ing OpltfiledCriticalKarel Mudr Stein
Priority to CS873439ApriorityCriticalpatent/CS268255B1/cs
Publication of CS343987A1publicationCriticalpatent/CS343987A1/cs
Publication of CS268255B1publicationCriticalpatent/CS268255B1/cs