Located in hi-tech development district of Chongqing, Chongqing Tongsheng Electromechanical Co.,Ltd.(Chongqing Tongsheng Electromechanical Institute) is a hi-tech enterprise and professional in research, design and production of oil-filtering machine; one of cooperative company of state operating oil standard and qualified enterprise of ISO9001-2000 standard; only company provided manufacturing license of anti-explosion oil-filtering machine; exclusive authorized company of advanced company in the counterparts of state technological inspection bureau of China.