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.А. НечаевfiledCriticalМ.А. Нечаев
Priority to SU175064ApriorityCriticalpatent/SU52087A1/ru
Application grantedgrantedCritical
Publication of SU52087A1publicationCriticalpatent/SU52087A1/ru