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.С. УгрюмовfiledCriticalП.С. Угрюмов
Priority to SU915-46ApriorityCriticalpatent/SU71391A1/en
Application grantedgrantedCritical
Publication of SU71391A1publicationCriticalpatent/SU71391A1/en