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Priority to JP1987052470UpriorityCriticalpatent/JPH0643900Y2/ja
Priority to US07/177,616prioritypatent/US4903025A/en
Publication of JPS63161457UpublicationCriticalpatent/JPS63161457U/ja
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Publication of JPH0643900Y2publicationCriticalpatent/JPH0643900Y2/ja