Manufacturing, modification, repair and sales of special vehicles, new energy vehicles, clean energy vehicles (including CNG, LNG), ordinary vehicles and engineering machinery; Manufacturing, repair and sales of drilling and production equipment and supporting facilities (including drilling rigs, water injection pumps, well washing pumps, fracturing pumps, mud pumps, generator sets, generator rooms, camp houses, downhole tools, tubing couplings, tubing); General mechanical processing, repair and sales; Installation, modification and repair of bridge and gantry cranes; Manufacturing, repair and sales of Class A vehicle-mounted boilers; Petroleum engineering technical services (including geophysical exploration, drilling, cementing, logging, fracturing, well logging, oil testing, gas testing, downhole operations, major and minor repairs of oil and gas wells, equipment repair and maintenance, oilfield construction, oil and gas pipeline construction); Road general cargo transportation; Manufacturing and sales of rubber hoses and hose assemblies; Sales of wires and cables; Manufacturing and sales of instruments and meters; Production, repair and sales of oil pumps and pumping units; Manufacturing, repair and sales of electrical, pneumatic, hydraulic components and control systems; Manufacturing and sales of dangerous chemical packaging and containers (atmospheric pressure) products; Import and export business; Equipment and house leasing. (Excluding commodities and technologies restricted or prohibited by the state from import and export.)