China High Speed Transmission Equipment Group Company, Ltd. (SEHK: 658) or China High Speed Transmission, China High Speed, is a high-speed gear transmission equipment manufacturer in China. It is the largest wind power transmission gear manufacturer in China. China High Speed Transmission was founded in 1969, formerly Nanjing Machine Tool Repairing Plant. In 1976, the plant was expanded and transformed to a gear manufacturer and changed its name to Nanjing Gear Box Factory. In 2001, the name was changed into an incorporated company.