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 С.Ф. РалльfiledCriticalС.Ф. Ралль
Priority to SU186380ApriorityCriticalpatent/SU50151A1/en
Application grantedgrantedCritical
Publication of SU50151A1publicationCriticalpatent/SU50151A1/en