Processing, manufacturing, and sales of petroleum machinery, oilfield equipment and supplies, and parts; production, sales, and repair of oilfield special vehicles, oil recovery vehicles, oil and water tank trucks, and automobiles (excluding cars, controlled items, and items requiring permits); research and development of oil extraction and drilling technologies; sales of automotive parts, communication equipment, wires and cables, general machinery, extraction and drilling equipment and parts, computer software and hardware and auxiliary equipment, instruments and meters, valves, and electronic products; oilfield technical services; import and export business of goods and technologies (excluding goods and technologies restricted or prohibited by laws and regulations). (The above business scope involves licensed items; operations shall be carried out within the validity period based on license certificates or approval documents, and operations without permission are prohibited.)