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.Я. ПопильскийfiledCriticalМ.Я. Попильский
Priority to SU1940ApriorityCriticalpatent/SU70304A1/ru
Application grantedgrantedCritical
Publication of SU70304A1publicationCriticalpatent/SU70304A1/ru