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Priority to JP1987135665UpriorityCriticalpatent/JPH0753083Y2/ja
Priority to US07/237,870prioritypatent/US4980728A/en
Publication of JPS6440856UpublicationCriticalpatent/JPS6440856U/ja
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Publication of JPH0753083Y2publicationCriticalpatent/JPH0753083Y2/ja