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
Publication of SU384235A1publicationCriticalpatent/SU384235A1/ru
Publication of SU361578A1publicationCriticalpatent/SU361578A1/ru
Application filed by П.И. ПетренкоfiledCriticalП.И. Петренко
Priority to SU9797ApriorityCriticalpatent/SU4742A1/ru
Application grantedgrantedCritical
Publication of SU4742A1publicationCriticalpatent/SU4742A1/ru