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
Publication of SU399687A1publicationCriticalpatent/SU399687A1/ru
Priority claimed from SU1773539Aexternal-prioritypatent/SU399687A1/ru
Application filedfiledCritical
Priority to SU1773539ApriorityCriticalpatent/SU399687A1/ru
Application grantedgrantedCritical
Publication of SU399687A2publicationCriticalpatent/SU399687A2/ru