SHANGHAI TONGDA USED CONSTRUCTION MACHINERY TRADING COã??ï¼?LTD stands as the exclusive and the largest company engaged in used consruction machinery. We have been engaged in selling used excavators, loaders, rollers and graders of Caterpillar, Komatsu and Hitachi. We would like to enlarge cooperation with both new and old customers from home and aborad to achieve win-win situation! You are welcome to visit us to inspect the machines!