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Priority to JP1988110561UpriorityCriticalpatent/JPH0612693Y2/ja
Publication of JPH0231533UpublicationCriticalpatent/JPH0231533U/ja
Priority to US07/642,542prioritypatent/US5088793A/en
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Publication of JPH0612693Y2publicationCriticalpatent/JPH0612693Y2/ja