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 М.А. ГутманfiledCriticalМ.А. Гутман
Priority to SU1187ApriorityCriticalpatent/SU71117A1/ru
Application grantedgrantedCritical
Publication of SU71117A1publicationCriticalpatent/SU71117A1/ru