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Sumitomo is a diversified corporation based in Tokyo, Japan. Formerly a zaibatsu, it is now one of the "Big Six" keiretsu.
Sumitomo was founded in Kyoto in the 1600s by bookseller and chemist Masatomo Sumitomo. Its main industry through most of the Edo era was copper mining, a business started by Sumitomo's brother-in-law Riemon Soga. The company was incorporated in 1919.
Sumitomo subsidiaries include:
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