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Application filed by Vladimir A Kovalenok, Ivan P Sipilenko, Leonid I BalykafiledCriticalVladimir A Kovalenok
Priority to CS828204ApriorityCriticalpatent/CS247125B1/en
Publication of CS820482A1publicationCriticalpatent/CS820482A1/en
Publication of CS247125B1publicationCriticalpatent/CS247125B1/en