Manufacturing of agricultural machinery; sales of agricultural machinery; leasing of agricultural machinery; manufacturing of specialized equipment (excluding licensed specialized equipment); repair of specialized equipment; sales of mechanical equipment; research and development of mechanical equipment; manufacturing of general equipment (excluding special equipment); repair of general equipment; sales of mechanical parts and components; manufacturing of packaging specialized equipment; sales of packaging specialized equipment; manufacturing of environmental protection specialized equipment; sales of environmental protection specialized equipment; manufacturing of domestic waste treatment equipment; sales of domestic waste treatment equipment; sales of ecological environment materials; sales of synthetic materials; manufacturing of hand carts and animal-drawn vehicles; sales of hand carts and animal-drawn vehicles; manufacturing of non-highway leisure vehicles and parts; sales of non-highway leisure vehicles and parts; manufacturing of automotive parts and accessories; sales of electric bicycles, mobility scooters, and parts; technical services, technology development, technical consultation, technology exchange, technology transfer, and technology promotion; leasing of non-residential real estate; import and export of goods; import and export of technology; retail of medical masks; sales of Class II medical devices; retail of protective supplies for medical staff; production of daily masks (non-medical); sales of daily masks (non-medical). Licensed items: power supply business; installation, maintenance, and testing of power transmission, power supply, and power receiving facilities.