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Priority to JP4466385UpriorityCriticalpatent/JPS61159676U/ja
Priority to GB8602955Aprioritypatent/GB2172665B/en
Priority to DE19863603742prioritypatent/DE3603742A1/de
Publication of JPS61159676UpublicationCriticalpatent/JPS61159676U/ja
Priority to US07/214,830prioritypatent/US4840544A/en