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Priority to JP1981060298UpriorityCriticalpatent/JPS57173434U/ja
Priority to KR2019820003183Uprioritypatent/KR880001438Y1/ko
Publication of JPS57173434UpublicationCriticalpatent/JPS57173434U/ja
H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission