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.И. ФроловfiledCriticalС.И. Фролов
Priority to SU149122ApriorityCriticalpatent/SU46317A1/en
Application grantedgrantedCritical
Publication of SU46317A1publicationCriticalpatent/SU46317A1/en