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 П.А. БобровfiledCriticalП.А. Бобров
Priority to SU77452ApriorityCriticalpatent/SU2143A1/ru
Application grantedgrantedCritical
Publication of SU2143A1publicationCriticalpatent/SU2143A1/ru