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 С.Ф. Юрьев, А.М. ЯмпольскийfiledCriticalС.Ф. Юрьев
Priority to SU808ApriorityCriticalpatent/SU63519A1/ru
Application grantedgrantedCritical
Publication of SU63519A1publicationCriticalpatent/SU63519A1/ru