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.Я. РомановfiledCriticalА.Я. Романов
Priority to SU1656ApriorityCriticalpatent/SU68938A1/ru
Application grantedgrantedCritical
Publication of SU68938A1publicationCriticalpatent/SU68938A1/ru