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Application filed by И.Д. Никифоров, А.Ф. НитченкоfiledCriticalИ.Д. Никифоров
Priority to SU120783ApriorityCriticalpatent/SU36286A1/ru
Application grantedgrantedCritical
Publication of SU36286A1publicationCriticalpatent/SU36286A1/ru