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 Н.Г. Лаптев, И.С. ХайкинfiledCriticalН.Г. Лаптев
Priority to SU149531ApriorityCriticalpatent/SU42553A1/en
Application grantedgrantedCritical
Publication of SU42553A1publicationCriticalpatent/SU42553A1/en