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 Н.П. Богородицкий, А.Т. Попов, И.Д. ФридбергfiledCriticalН.П. Богородицкий
Priority to SU44146ApriorityCriticalpatent/SU74303A2/en
Application grantedgrantedCritical
Publication of SU74303A2publicationCriticalpatent/SU74303A2/en