henan rongfeng Sales, modification and maintenance of construction machinery; manufacturing, maintenance and sales of petroleum drilling and extraction equipment and accessories; operation and technical services of environmental protection facilities; petroleum engineering technical services; manufacturing and sales of electrical, gas and hydraulic components and their control systems; manufacturing, maintenance and sales of containers (non-pressure type); sales, modification and maintenance of special vehicles, new energy vehicles and ordinary vehicles; maintenance and sales of on-board special boilers; Sales: automotive parts, rubber hoses, hose assemblies, wires and cables, electromechanical equipment, instruments and meters, office supplies, hardware and electrical appliances, pumps and valves; Import and export business of vehicles, equipment leasing goods and technologies (except for goods and technologies prohibited by national laws and regulations; those that require special approval under laws and regulations, shall not operate before obtaining the approval).