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Priority to JP9953080UpriorityCriticalpatent/JPS5722657U/ja
Priority to US06/265,405prioritypatent/US4373485A/en
Priority to DE8181103951Tprioritypatent/DE3167417D1/de
Priority to EP81103951Aprioritypatent/EP0043905B1/en
Publication of JPS5722657UpublicationCriticalpatent/JPS5722657U/ja