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Priority to JP1989004830UpriorityCriticalpatent/JPH0298398U/ja
Priority to CN 89109514prioritypatent/CN1024381C/zh
Priority to KR1019890019742Aprioritypatent/KR930007788B1/ko
Publication of JPH0298398UpublicationCriticalpatent/JPH0298398U/ja
Priority to US07/833,808prioritypatent/US5196640A/en