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Application filed by Frantisek Ing Cerny, Jilji Ing Csc Novotny, Vladimir ZemanfiledCriticalFrantisek Ing Cerny
Priority to CS832923ApriorityCriticalpatent/CS243724B1/cs
Publication of CS292383A1publicationCriticalpatent/CS292383A1/cs
Publication of CS243724B1publicationCriticalpatent/CS243724B1/cs