Special equipment manufacturing of oil drilling and special equipment sales of petroleum drilling and special equipment; Engineering and technical services (except planning management, survey, design, and supervision); Special equipment sales; Mechanical equipment research and development; General equipment manufacturing (excluding special equipment manufacturing); Mechanical equipment sales; Mechanical equipment leasing; Intelligent robot research and development; Intelligent robot sales; Intelligent unmanned aircraft manufacturing; Intelligent unmanned aircraft sales; Mechanical and electrical equipment manufacturing; Mechanical and electrical equipment sales; Electrical equipment repair; Instrument and instrument repair; Instrument and instrument sales; Chemical product sales (excluding licensed chemical products); Import and export of goods. (Except for projects that require approval according to law, conduct business activities independently in accordance with the law with a business license) Licensed projects: Special equipment design; Special equipment manufacturing; Inspection and testing services; Road cargo transportation (excluding dangerous goods).