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 Ф.Я. ЩепотинfiledCriticalФ.Я. Щепотин
Priority to SU125441ApriorityCriticalpatent/SU41259A1/en
Application grantedgrantedCritical
Publication of SU41259A1publicationCriticalpatent/SU41259A1/en