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 SU2141037ApriorityCriticalpatent/SU539177A1/ru
Application grantedgrantedCritical
Publication of SU539177A1publicationCriticalpatent/SU539177A1/ru