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Priority to JP15944278UpriorityCriticalpatent/JPS5576238U/ja
Priority to DE7979901540Tprioritypatent/DE2965956D1/de
Priority to PCT/JP1979/000292prioritypatent/WO1980001087A1/ja
Publication of JPS5576238UpublicationCriticalpatent/JPS5576238U/ja
Priority to EP19790901540prioritypatent/EP0020779B1/en