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 М.М. КравцовfiledCriticalМ.М. Кравцов
Priority to SU143839ApriorityCriticalpatent/SU39977A1/en
Application grantedgrantedCritical
Publication of SU39977A1publicationCriticalpatent/SU39977A1/en