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Application filed by М.М. Бутелов, В.В. Налимов, П.В. ТимофеевfiledCriticalМ.М. Бутелов
Priority to SU139490ApriorityCriticalpatent/SU39881A1/en
Application grantedgrantedCritical
Publication of SU39881A1publicationCriticalpatent/SU39881A1/en