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 А.Ф. Ермолаев, Е.Ф. ЕрмолаевfiledCriticalА.Ф. Ермолаев
Priority to SU2ApriorityCriticalpatent/SU68996A1/en
Application grantedgrantedCritical
Publication of SU68996A1publicationCriticalpatent/SU68996A1/en