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Priority to JP1987171716UpriorityCriticalpatent/JPH0750274Y2/ja
Priority to US07/254,819prioritypatent/US4977487A/en
Publication of JPH0176332UpublicationCriticalpatent/JPH0176332U/ja
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Publication of JPH0750274Y2publicationCriticalpatent/JPH0750274Y2/ja