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Priority to JP1987128559UpriorityCriticalpatent/JPH0440677Y2/ja
Priority to US07/234,957prioritypatent/US4915606A/en
Publication of JPS6434032UpublicationCriticalpatent/JPS6434032U/ja
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Publication of JPH0440677Y2publicationCriticalpatent/JPH0440677Y2/ja