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Priority to JP17961986UpriorityCriticalpatent/JPS6384171U/ja
Priority to US07/076,180prioritypatent/US4881900A/en
Priority to DE8787306490Tprioritypatent/DE3782463T2/de
Priority to EP87306490Aprioritypatent/EP0254554B1/en
Publication of JPS6384171UpublicationCriticalpatent/JPS6384171U/ja