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 SU1441836ApriorityCriticalpatent/SU409887A1/ru
Application grantedgrantedCritical
Publication of SU409887A1publicationCriticalpatent/SU409887A1/ru