Technological Development Zone, and Shanghai Caohejing High-Tech Development Zone, are backbones of Shanghai's secondary industry. Heavy industries accounted for 78% of the gross industrial output in 2009. China’s largest steelmaker Baosteel Group and Jiangnan Shipyard, one of China's oldest shipbuilders are both located in Shanghai. Auto manufacture is another important industry. The Shanghai-based SAIC Motor is one of the three largest automotive corporations in China, and has strategic partnerships with Volkswagen and General Motors
