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 filed by Р.Г. Ришина, В.А. ТрапезниковfiledCriticalР.Г. Ришина
Priority to SU97747ApriorityCriticalpatent/SU28573A1/ru
Application grantedgrantedCritical
Publication of SU28573A1publicationCriticalpatent/SU28573A1/ru