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Application filed by Vasilij N Sik, Oleg D Levcenko, Vjaceslav N Sujskij, Petr N Trjapickin, Jurij J Nosovskij, Sofja A Osinceva, Aron J KucenkofiledCriticalVasilij N Sik
Publication of CS634381A1publicationCriticalpatent/CS634381A1/en
Publication of CS237444B1publicationCriticalpatent/CS237444B1/en