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Priority to JP1987141450UpriorityCriticalpatent/JPS6446501U/ja
Priority to US07/174,361prioritypatent/US4872486A/en
Priority to DE3810507Aprioritypatent/DE3810507C2/de
Priority to KR1019880003512Aprioritypatent/KR920008807B1/ko
Priority to GB8807588Aprioritypatent/GB2203800B/en
Publication of JPS6446501UpublicationCriticalpatent/JPS6446501U/ja