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.)
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Publication date
Application filed by А.Ф. Воробьев, М.С. ЗахарьевскийfiledCriticalА.Ф. Воробьев
Priority to SU248ApriorityCriticalpatent/SU65829A1/ru
Application grantedgrantedCritical
Publication of SU65829A1publicationCriticalpatent/SU65829A1/ru