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 К.А. Краснов, Г.Г. ПоварнинfiledCriticalК.А. Краснов
Priority to SU189245ApriorityCriticalpatent/SU50685A1/en
Application grantedgrantedCritical
Publication of SU50685A1publicationCriticalpatent/SU50685A1/en