General project: Metal processing machinery manufacturing; Manufacturing of hydraulic power machinery and components; Sales of hydraulic power machinery and components; Manufacturing of pneumatic power machinery and components; Sales of pneumatic power machinery and components; Processing of Machine element and spare parts; Sales of Machine element and spare parts; Mining machinery manufacturing; Sales of mining machinery; Machinery manufacturing for construction engineering; Sales of construction machinery; Installation services for general mechanical equipment; Sales of mechanical equipment; Rental of mechanical equipment; Rental of construction machinery and equipment; Special equipment repair; Sales of metal products; Metal structure manufacturing; Metal structure sales; Sales of machine tool functional components and accessories; Special equipment sales; Rental of special equipment; Manufacturing of supply instruments and meters; Sales of supply instruments and meters; Special equipment manufacturing (excluding licensed professional equipment manufacturing); Sales of specialized environmental protection equipment; Manufacturing of ecological environment monitoring and testing instruments and meters; Manufacturing of water quality pollutant monitoring and detection instruments and meters; Manufacturing of specialized instruments and meters for environmental monitoring; Manufacturing of environmental emergency testing instruments and meters (except for projects that require approval in accordance with the law, operating activities shall be carried out independently with the business license in accordance with the law)