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.П. Печников, П.Н. СкаткинfiledCriticalП.П. Печников
Priority to SU379661ApriorityCriticalpatent/SU77192A1/en
Application grantedgrantedCritical
Publication of SU77192A1publicationCriticalpatent/SU77192A1/en