Manufacturing of specialized equipment for oil drilling and extraction; sales of specialized equipment for oil drilling and extraction; manufacturing of specialized equipment for environmental protection; sales of specialized equipment for environmental protection; repair of specialized equipment; repair of general equipment; manufacturing of instruments and meters; sales of instruments and meters; repair of instruments and meters; oil and natural gas technical services; engineering technical services (excluding planning management, survey, design, and supervision); engineering management services; information system integration services; design and construction services for security technology prevention systems; water pollution control; solid waste treatment; landscaping engineering construction; sales of specialized chemical products (excluding hazardous chemicals); sales of chemical products (excluding licensed chemical products); sales of non-metallic mineral products and their products; sales of lubricating oil; retail of automotive parts; sales of building materials; sales of building decoration materials; retail of hardware products; sales of furniture; sales of mechanical equipment; sales of mechanical and electrical equipment; sales of power facility accessories; sales of security equipment; sales of digital video surveillance systems; operation and leasing services for small and micro passenger vehicles; leasing of special equipment; leasing of non-residential real estate; motor vehicle repair and maintenance; catering management; unit logistics management services; loading and unloading; manufacturing of non-metallic mineral products; labor services (excluding labor dispatch); software development; data processing and storage support services; business secretarial services; business agency services. Licensed items: road cargo transportation (excluding dangerous goods); labor dispatch services; construction engineering construction; road motor vehicle production.