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Geology of Japan, p. 94., p. 94, at Google Books Shin-Etsu Chemical, company's history; excerpt, "Shin-Etsu Chemical Co., Ltd. began with the coming together

Kōshin'etsu (甲信越) is a subregion of the Chūbu region in Japan consisting of Yamanashi, Nagano, and Niigata prefectures. The name Kōshin'etsu is a composite