Taichung City has six primary industries, including tool machines and mechanical components, the photoelectric panel industry, bicycles and parts, woodworking machinery, hand tools, and the aerospace industry. Along 60 kilometers of Mt. DaDu in Taichung City, the Golden Valley has 1500 precision machinery suppliers and tens of thousands of downstream suppliers. The employed population exceeds 300000, with an annual output value of NTD 900 billion. It is a precision mechanical cluster with the highest output value and density per unit area globally.