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Priority to JP1988125244UpriorityCriticalpatent/JPH0437685Y2/ja
Priority to US07/410,589prioritypatent/US4960285A/en
Priority to KR2019890013773Uprioritypatent/KR920007064Y1/ko
Publication of JPH0247109UpublicationCriticalpatent/JPH0247109U/ja
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Publication of JPH0437685Y2publicationCriticalpatent/JPH0437685Y2/ja