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Priority to JP1989082452UpriorityCriticalpatent/JPH0321570U/ja
Priority to US07/551,371prioritypatent/US5081366A/en
Priority to KR1019900010453Aprioritypatent/KR940009057B1/ko
Publication of JPH0321570UpublicationCriticalpatent/JPH0321570U/ja
