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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Application filed by Б.Б. ПротопоповfiledCriticalБ.Б. Протопопов
Priority to SU97970ApriorityCriticalpatent/SU28072A1/ru
Application grantedgrantedCritical
Publication of SU28072A1publicationCriticalpatent/SU28072A1/ru