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Priority to JP11404987UpriorityCriticalpatent/JPH043933Y2/ja
Priority to KR2019880007699Uprioritypatent/KR920008730Y1/ko
Publication of JPS6420404UpublicationCriticalpatent/JPS6420404U/ja
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Publication of JPH043933Y2publicationCriticalpatent/JPH043933Y2/ja