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Priority to JP19671384UpriorityCriticalpatent/JPS61115281U/ja
Priority to GB08531720Aprioritypatent/GB2168964B/en
Priority to KR1019850010021Aprioritypatent/KR910004931B1/ko
Publication of JPS61115281UpublicationCriticalpatent/JPS61115281U/ja
Priority to US07/075,184prioritypatent/US4776487A/en