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Priority to JP1988137285UpriorityCriticalpatent/JPH0729960Y2/ja
Publication of JPH0259750UpublicationCriticalpatent/JPH0259750U/ja
Priority to US07/664,484prioritypatent/US5216775A/en
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Publication of JPH0729960Y2publicationCriticalpatent/JPH0729960Y2/ja