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.С. ПустоветовfiledCriticalП.С. Пустоветов
Priority to SU50872ApriorityCriticalpatent/SU75909A1/ru
Application grantedgrantedCritical
Publication of SU75909A1publicationCriticalpatent/SU75909A1/ru