Production and sales of drilling machinery equipment and accessories; Mud pump and accessories; Research and development of production technology for battery sightseeing vehicles and internal combustion sightseeing vehicles; Sales of bearings, rubber and plastic products, hardware and electromechanical products, battery sightseeing vehicles, and internal combustion sightseeing vehicles; Processing and sales of automotive parts, vehicle electrical appliances, and vehicle interior accessories; Assembly and sales of two-wheeled electric assisted bicycles.