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Priority to JP1977123108UpriorityCriticalpatent/JPS5527252Y2/ja
Priority to US05/940,337prioritypatent/US4209754A/en
Publication of JPS5449864UpublicationCriticalpatent/JPS5449864U/ja
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Publication of JPS5527252Y2publicationCriticalpatent/JPS5527252Y2/ja