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 grantedgrantedCritical
Publication of SU6297A1publicationCriticalpatent/SU6297A1/en
Application filed by С.М. БарканfiledCriticalС.М. Баркан
Priority to SU561ApriorityCriticalpatent/SU65473A1/en
Publication of SU65473A1publicationCriticalpatent/SU65473A1/en