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Priority to JP1987155799UpriorityCriticalpatent/JPH0710325Y2/ja
Priority to US07/256,865prioritypatent/US4948227A/en
Publication of JPH0159209UpublicationCriticalpatent/JPH0159209U/ja
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Publication of JPH0710325Y2publicationCriticalpatent/JPH0710325Y2/ja