------In January 1978, Nanjing Branch, China Chemical, Machinery, Metals, Minerals Imp. & Exp. Company, under the jurisdiction of Jiangsu Foreign Trade Committee
------In April 1988, renamed as Nanjing Chemical, Machinery, Metals, Minerals Imp.&Exp. Co., conferred the operation right of import and export;
------In January 1989, renamed as Jiangsu Nanjing Chemical, Machinery, Metals,Minerals Imp. & Exp. Co.
------In February 1991, renamed as Nanjing Machinery, Metals, Minerals, Medicines & Health Products Imp. & Exp. Co.
------In June, 1994, reformed into Nanjing Machinery, Metals, Minerals, Medicines & Health Products Imp. & Exp. Corp., Ltd., whose 80% shares were state-owned, 20%employee-owned.
------In Dec. 2004, reformed for the second time into a company with limited liabilities, in which the management owned 70% and state owned 30% shares;
------In Dec. 2005, the company was renamed as Du-hope international group.