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Application filed by М.А. ФроловfiledCriticalМ.А. Фролов
Priority to SU134484ApriorityCriticalpatent/SU39135A1/ru
Publication of SU36025A1publicationCriticalpatent/SU36025A1/ru
Application grantedgrantedCritical
Publication of SU39135A1publicationCriticalpatent/SU39135A1/ru