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 А.И. ПротопоповfiledCriticalА.И. Протопопов
Priority to SU113966ApriorityCriticalpatent/SU32681A1/en
Application grantedgrantedCritical
Publication of SU32681A1publicationCriticalpatent/SU32681A1/en