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 А.В. Кашперов, А.А. ПреображенскийfiledCriticalА.В. Кашперов
Priority to SU4552ApriorityCriticalpatent/SU74563A1/ru
Application grantedgrantedCritical
Publication of SU74563A1publicationCriticalpatent/SU74563A1/ru