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Priority to JP1987166370UpriorityCriticalpatent/JPH0525341Y2/ja
Priority to US07/252,305prioritypatent/US4880277A/en
Publication of JPH0170659UpublicationCriticalpatent/JPH0170659U/ja
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Publication of JPH0525341Y2publicationCriticalpatent/JPH0525341Y2/ja