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Publication of SU396876A1publicationCriticalpatent/SU396876A1/ru
Application filed by А.А. Рамлов, В.И. ФридманfiledCriticalА.А. Рамлов
Priority to SU4283ApriorityCriticalpatent/SU64403A1/ru
Application grantedgrantedCritical
Publication of SU64403A1publicationCriticalpatent/SU64403A1/ru