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 Д.А. ИльинfiledCriticalД.А. Ильин
Priority to SU374303ApriorityCriticalpatent/SU75453A1/en
Application grantedgrantedCritical
Publication of SU75453A1publicationCriticalpatent/SU75453A1/en