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Priority to JP1976166856UpriorityCriticalpatent/JPS576929Y2/ja
Priority to US05/859,473prioritypatent/US4254634A/en
Publication of JPS5382857UpublicationCriticalpatent/JPS5382857U/ja
Application grantedgrantedCritical
Publication of JPS576929Y2publicationCriticalpatent/JPS576929Y2/ja