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 С.С. ГромовfiledCriticalС.С. Громов
Priority to SU72691ApriorityCriticalpatent/SU25692A1/en
Application grantedgrantedCritical
Publication of SU25692A1publicationCriticalpatent/SU25692A1/en