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.)
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Publication date
Application filed by Н.П. Красников, В.С. ПодъельскийfiledCriticalН.П. Красников
Priority to SU178ApriorityCriticalpatent/SU65222A1/ru
Application grantedgrantedCritical
Publication of SU65222A1publicationCriticalpatent/SU65222A1/ru