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 В.Я. Колосов, Л.Я. СлавинfiledCriticalВ.Я. Колосов
Priority to SU81ApriorityCriticalpatent/SU71218A1/en
Application grantedgrantedCritical
Publication of SU71218A1publicationCriticalpatent/SU71218A1/en