Road motor vehicle production; special equipment design; special equipment manufacturing; special equipment installation, modification, and repair. General items: sales of special equipment; automobile sales; mining machinery manufacturing; mining machinery sales; manufacturing of automotive parts and accessories; machining of mechanical parts; motor vehicle repair and maintenance; manufacturing of hydraulic power machinery and components; sales of hydraulic power machinery and components; sales of lubricating oil; sales of new energy vehicles; sales of metal materials; import and export of goods.