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Priority to JP11405287UpriorityCriticalpatent/JPH043936Y2/ja
Priority to KR2019880007699Uprioritypatent/KR920008730Y1/ko
Publication of JPS6420407UpublicationCriticalpatent/JPS6420407U/ja
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Publication of JPH043936Y2publicationCriticalpatent/JPH043936Y2/ja