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Priority to JP1987058947UpriorityCriticalpatent/JPH0749709Y2/ja
Priority to US07/132,249prioritypatent/US4788389A/en
Publication of JPS63176243UpublicationCriticalpatent/JPS63176243U/ja
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Publication of JPH0749709Y2publicationCriticalpatent/JPH0749709Y2/ja