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Priority to JP1987140246UpriorityCriticalpatent/JPH0544963Y2/ja
Priority to KR1019880011876Aprioritypatent/KR890005453A/ko
Publication of JPS6444509UpublicationCriticalpatent/JPS6444509U/ja
Priority to KR2019910017547Uprioritypatent/KR920000021Y1/ko
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Publication of JPH0544963Y2publicationCriticalpatent/JPH0544963Y2/ja