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 М.Ф. ГрезневfiledCriticalМ.Ф. Грезнев
Priority to SU151551ApriorityCriticalpatent/SU42388A1/en
Application grantedgrantedCritical
Publication of SU42388A1publicationCriticalpatent/SU42388A1/en