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. С. Уманский, Л. В. КузьминfiledCriticalВ. С. Уманский
Priority to SU1719340ApriorityCriticalpatent/SU427457A1/en
Priority claimed from SU1719340Aexternal-prioritypatent/SU427457A1/en
Application grantedgrantedCritical
Publication of SU427457A2publicationCriticalpatent/SU427457A2/en
Publication of SU427457A1publicationCriticalpatent/SU427457A1/en