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Application filed by Е.Ф. Беленький, Д.М. Красинская, Д.М. КрасинскаfiledCriticalЕ.Ф. Беленький
Priority to SU84569ApriorityCriticalpatent/SU25662A1/ru
Application grantedgrantedCritical
Publication of SU25662A1publicationCriticalpatent/SU25662A1/ru