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Priority to JP1989091791UpriorityCriticalpatent/JPH0331767U/ja
Priority to KR1019900010169Aprioritypatent/KR940003107B1/ko
Priority to GB9014844Aprioritypatent/GB2234467B/en
Priority to DE4021242Aprioritypatent/DE4021242C2/de
Priority to US07/551,948prioritypatent/US5235384A/en
Publication of JPH0331767UpublicationCriticalpatent/JPH0331767U/ja