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Priority to JP1989051976UpriorityCriticalpatent/JPH076808Y2/ja
Priority to US07/511,429prioritypatent/US4993174A/en
Publication of JPH02143013UpublicationCriticalpatent/JPH02143013U/ja
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Publication of JPH076808Y2publicationCriticalpatent/JPH076808Y2/ja