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.М. ПетровfiledCriticalН.М. Петров
Priority to SU379733ApriorityCriticalpatent/SU77045A1/ru
Application grantedgrantedCritical
Publication of SU77045A1publicationCriticalpatent/SU77045A1/ru