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Priority to JP1976088990UpriorityCriticalpatent/JPS5428433Y2/ja
Priority to US05/743,491prioritypatent/US4078985A/en
Publication of JPS537446UpublicationCriticalpatent/JPS537446U/ja
Application grantedgrantedCritical
Publication of JPS5428433Y2publicationCriticalpatent/JPS5428433Y2/ja