On February 8 2018, just prior to the opening date of Pyeong Chang Olympic accompanied by Assoc. Prof. So Sasaki, Chuo University under coordination of Prof Yu Jeonsoo, Tohoku University I visited the Head Office of Dunsuk regarded as top ranked secondary lead smelter in Korea located at Shiwha Indusrial Park, Gyeonggi halfway from Seoul to Incheon to conduct a hearing survey on
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