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
Publication of SU408475A1publicationCriticalpatent/SU408475A1/ru
Application filed by Б.Н. ПетровскийfiledCriticalБ.Н. Петровский
Priority to SU32393ApriorityCriticalpatent/SU59884A1/ru
Application grantedgrantedCritical
Publication of SU59884A1publicationCriticalpatent/SU59884A1/ru