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Wikipedia definition
1. Masataka OgawaMasataka Ogawa was a Japanese chemist known for the discovery of rhenium, which he named nipponium. After graduating from the University of Tokyo, he studied under William Ramsay in London, where he worked on the analysis of the rare mineral thorianite. He extracted and isolated a small amount of an apparently unknown substance from the mineral, which he announced as the discovery of element 43, naming the newly-discovered element nipponium.
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