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 Д.Н. Андреев, А.Д. ПетровfiledCriticalД.Н. Андреев
Priority to SU198343ApriorityCriticalpatent/SU50655A1/ru
Application grantedgrantedCritical
Publication of SU50655A1publicationCriticalpatent/SU50655A1/ru