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Application filed by Г. Э. Левин , М. Е. ГришинfiledCriticalГ. Э. Левин , М. Е. Гришин
Priority to SU1497663ApriorityCriticalpatent/SU339240A1/ru
Application grantedgrantedCritical
Publication of SU339240A1publicationCriticalpatent/SU339240A1/ru