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.П. ИзвековfiledCriticalН.П. Извеков
Priority to SU147639ApriorityCriticalpatent/SU44124A1/en
Application grantedgrantedCritical
Publication of SU44124A1publicationCriticalpatent/SU44124A1/en