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 SU4430393/12ApriorityCriticalpatent/RU1619759C/ru
Application grantedgrantedCritical
Publication of RU1619759CpublicationCriticalpatent/RU1619759C/ru