Tianjin Yishan Construction Machinery Co., Ltd. (Tianjin Construction Machinery Factory) is the earliest company manufacturing tracked bulldozer in China. In 1958, the first tracked bulldozer of China was manufactured in the company, and in 1993, the company became the first enterprise to sell more than 10 thousand of bulldozers in China. Currently, it is the leading enterprise in the earth moving machinery industry of China. Successively subjected to National Construction Bureau, Machinery Bureau, People's Liberation Army General Logistics Department, and now the company is subjected to Xinxing Ductile Iron Pipes Group Co., Ltd. which is under direct control of state-owned Property Committee of the State Council.