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Priority to JP1989006164UpriorityCriticalpatent/JPH0715767Y2/ja
Priority to US07/381,318prioritypatent/US4957036A/en
Publication of JPH0298011UpublicationCriticalpatent/JPH0298011U/ja
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Publication of JPH0715767Y2publicationCriticalpatent/JPH0715767Y2/ja