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Priority to JP1984196712UpriorityCriticalpatent/JPH0219893Y2/ja
Priority to GB08531720Aprioritypatent/GB2168964B/en
Priority to KR1019850010021Aprioritypatent/KR910004931B1/ko
Publication of JPS61115280UpublicationCriticalpatent/JPS61115280U/ja
Priority to US07/075,184prioritypatent/US4776487A/en
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Publication of JPH0219893Y2publicationCriticalpatent/JPH0219893Y2/ja