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 Д.Р. Абрагам, И.С. КизверfiledCriticalД.Р. Абрагам
Priority to SU716ApriorityCriticalpatent/SU72899A1/ru
Application grantedgrantedCritical
Publication of SU72899A1publicationCriticalpatent/SU72899A1/ru