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.Я. ГителисfiledCriticalН.Я. Гителис
Priority to SU61666ApriorityCriticalpatent/SU28292A1/ru
Application grantedgrantedCritical
Publication of SU28292A1publicationCriticalpatent/SU28292A1/ru