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 SU396014A1publicationCriticalpatent/SU396014A1/ru
Application filed by А.А. ЛемхенfiledCriticalА.А. Лемхен
Priority to SU34550ApriorityCriticalpatent/SU15817A1/ru
Application grantedgrantedCritical
Publication of SU15817A1publicationCriticalpatent/SU15817A1/ru