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.Я. ПурценfiledCriticalР.Я. Пурцен
Priority to SU749ApriorityCriticalpatent/SU72232A1/ru
Application grantedgrantedCritical
Publication of SU72232A1publicationCriticalpatent/SU72232A1/ru