Sales of machinery and equipment; trade brokerage; import and export of goods; general equipment repair; general machinery and equipment installation services; technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; sales of electrical equipment; sales of mechanical parts and components; retail of automobile spare parts; retail of motorcycles and spare parts; business of wires and cables; sales of metal cutting and welding equipment; sales of instruments and meters; retail of hardware products; sales of metal products; wholesale of electronic components; sales of chemical products (excluding licensed chemical products); sales of construction materials; sales of metal materials.