Shandong Wantong hydraulic co.,ltd, sets up in 2004, is a speacialized hydraulic cylinder manufacturing enterprise which takes up with design, research and manufacture of hydraulic cylinder. The main products are dumper truck telescopic cylinder, coal mine machinery hydraulic cylinder, ocean engineering hydraulic cylinder,including over120 kinds. Now it has been the largest manufacturing base of hydraulic c ylinder in Shandong province and the first listed companies of Rizhao City in “NEEQ”, with its annual production capacity of 200,000 sets.