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Priority to JP1987180509UpriorityCriticalpatent/JPH0641031Y2/ja
Priority to DE19883840013prioritypatent/DE3840013C2/de
Publication of JPH0183975UpublicationCriticalpatent/JPH0183975U/ja
Priority to US07/453,034prioritypatent/US5050635A/en
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Publication of JPH0641031Y2publicationCriticalpatent/JPH0641031Y2/ja