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 Н.М. Зарубин, Н.Е. КлазfiledCriticalН.М. Зарубин
Priority to SU376306ApriorityCriticalpatent/SU77904A1/en
Application grantedgrantedCritical
Publication of SU77904A1publicationCriticalpatent/SU77904A1/en