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Application filed by А. А. Зайцев , Л. Г. ХодскийfiledCriticalА. А. Зайцев , Л. Г. Ходский
Priority to SU1329641ApriorityCriticalpatent/SU278983A1/ru
Application grantedgrantedCritical
Publication of SU278983A1publicationCriticalpatent/SU278983A1/ru