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Priority to JP1971009779UpriorityCriticalpatent/JPS5120464Y2/ja
Priority to US00173711Aprioritypatent/US3723680A/en
Publication of JPS477659UpublicationCriticalpatent/JPS477659U/ja
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Publication of JPS5120464Y2publicationCriticalpatent/JPS5120464Y2/ja