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 В. Н. КазанскийfiledCriticalВ. Н. Казанский
Priority to SU1838168ApriorityCriticalpatent/SU418598A2/ru
Application grantedgrantedCritical
Publication of SU418598A1publicationCriticalpatent/SU418598A1/ru
Publication of SU418598A2publicationCriticalpatent/SU418598A2/ru