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Sumitomo Corporation (住友商事, Sumitomo Shōji) is a highly built worldwide trading company (Sogo shosha), and is a diversified corporation based in Tokyo, Japan. It is a member company of the Sumitomo Group. 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. In 1996, the company disclosed a loss of 2.6 billion dollars, blaming unauthorized trades by its chief copper trader, Yasuo Hamanaka, over a period of more than ten years. Today, the company, Sumitomo Corporation, is one of the top three Sogo shosha companies in the world.
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