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 filedfiledCritical
Priority to SU1957603ApriorityCriticalpatent/SU469821A2/ru
Application grantedgrantedCritical
Publication of SU469821A2publicationCriticalpatent/SU469821A2/ru