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Priority claimed from KR2019880018139Uexternal-prioritypatent/KR910002021Y1/ko
Priority claimed from KR2019880018356Uexternal-prioritypatent/KR910008957Y1/ko
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Priority to JP12896889UpriorityCriticalpatent/JPH0317964U/ja
Publication of JPH0317964UpublicationCriticalpatent/JPH0317964U/ja