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 Д.К. КиселевfiledCriticalД.К. Киселев
Priority to SU386198ApriorityCriticalpatent/SU77038A1/en
Application grantedgrantedCritical
Publication of SU77038A1publicationCriticalpatent/SU77038A1/en