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Priority to JP1987057515UpriorityCriticalpatent/JPH088109Y2/ja
Publication of JPS63166433UpublicationCriticalpatent/JPS63166433U/ja
Priority to US07/474,626prioritypatent/US5024541A/en
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Publication of JPH088109Y2publicationCriticalpatent/JPH088109Y2/ja