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 Б.С. Воронцов, Н.В. ФилипповfiledCriticalБ.С. Воронцов
Priority to SU20765ApriorityCriticalpatent/SU30275A1/ru
Application grantedgrantedCritical
Publication of SU30275A1publicationCriticalpatent/SU30275A1/ru