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.К. Андреев, В.Я. СердюковfiledCriticalД.К. Андреев
Priority to SU138453ApriorityCriticalpatent/SU38145A1/en
Application grantedgrantedCritical
Publication of SU38145A1publicationCriticalpatent/SU38145A1/en