Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by А. Е. КовалевfiledCriticalА. Е. Ковалев
Priority to SU1883953ApriorityCriticalpatent/SU441215A2/ru
Application grantedgrantedCritical
Publication of SU441215A1publicationCriticalpatent/SU441215A1/ru
Publication of SU441215A2publicationCriticalpatent/SU441215A2/ru