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.Н. СтроковfiledCriticalФ.Н. Строков
Priority to SU662-45ApriorityCriticalpatent/SU66690A1/ru
Application grantedgrantedCritical
Publication of SU66690A1publicationCriticalpatent/SU66690A1/ru