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 А.А. ДавыдовfiledCriticalА.А. Давыдов
Priority to SU112319ApriorityCriticalpatent/SU30781A1/en
Application grantedgrantedCritical
Publication of SU30781A1publicationCriticalpatent/SU30781A1/en