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.Э. РикертfiledCriticalП.Э. Рикерт
Priority to SU47065ApriorityCriticalpatent/SU72161A1/en
Application grantedgrantedCritical
Publication of SU72161A1publicationCriticalpatent/SU72161A1/en