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Priority to JP11335585UpriorityCriticalpatent/JPS6221672U/ja
Priority to KR2019860002680Uprioritypatent/KR900000567Y1/ko
Priority to US06/887,906prioritypatent/US4747159A/en
Publication of JPS6221672UpublicationCriticalpatent/JPS6221672U/ja