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Priority to JP1976077283UpriorityCriticalpatent/JPS5629328Y2/ja
Priority to US05/796,030prioritypatent/US4116403A/en
Publication of JPS531820UpublicationCriticalpatent/JPS531820U/ja
Application grantedgrantedCritical
Publication of JPS5629328Y2publicationCriticalpatent/JPS5629328Y2/ja