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.П. Пичугин, П.А. ПодхалюзинfiledCriticalА.П. Пичугин
Priority to SU2425ApriorityCriticalpatent/SU72029A1/ru
Application grantedgrantedCritical
Publication of SU72029A1publicationCriticalpatent/SU72029A1/ru