 Traditionally, Kiryū's principal industry was sericulture and silk textile manufacturing, with records dating silk production as far back as 713.Pachinko manufacturing arrived in Kiryū after World War II, during the period of industrial reconstruction, with the formation of two main companies—the Heiwa Corporation in 1949, and the Sophia Corporation in 1951.Kiryū's factories are responsible for manufacturing 60% of Japan's pachinko machines.