Production, sale, and repair of electrical appliances, electric motors, power transformers, high and low voltage power distribution cabinets and control cabinets; production, sale, and repair of pumping units, engineering machinery, electromechanical equipment, downhole pipes and tools, rigging, wellhead equipment, hooks, pumps, electric heating rods, wires and cables, traveling blocks; production, sale, and repair of petroleum machinery parts, electronic equipment, computers, communication equipment (excluding ground satellite receivers and radio transmitters), and refrigeration equipment; production and sale of oilfield operation equipment, oilfield special operation vehicles, clothing, cement prefabricated products, and labor protection supplies; sale of chemical products (excluding dangerous goods); drilling and well logging services; well flushing operations; downhole operations, oil and water well technical services and repair; oil and water well profile control and water plugging construction technical services; geothermal waste heat systems, new energy development and technical services; Class II motor vehicle maintenance (maintenance of large and medium-sized trucks; maintenance of small vehicles) (valid until the license expires); general freight transportation, special cargo transportation (tank type), large object transportation, dangerous goods transportation (Class 3) (valid until the license expires); housing, equipment, and vehicle leasing; real estate development; waste material acquisition, processing, and sales; drilling mud treatment; noise control, solid waste harmless treatment; production and sale of oilfield mixed hydrocarbons (excluding hazardous chemicals) and natural gas [rich in methane]; (the following only for branch operations) production and sale of stable light hydrocarbons and oilfield mixed hydrocarbons.