Special equipment sales; Rental of special equipment; General equipment manufacturing; Manufacturing of material handling equipment; Manufacturing of specialized environmental protection equipment; Sales of specialized environmental protection equipment; Leasing of construction machinery and equipment; Sales of mechanical equipment; Sales of metal products; Sales of metal wire ropes and their products; Sales of intelligent warehousing equipment; Sales of rail transit engineering machinery and components; General component manufacturing; Sales of intelligent port loading and unloading equipment; Sales of material handling equipment (except for projects that require approval according to law, business activities can be carried out independently based on the business license) License project: Special equipment manufacturing (for projects that require approval according to law, business activities can only be carried out after approval by relevant departments. The specific business projects are subject to the approval documents or licenses of relevant departments)