Manufacturing of special equipment for oil drilling and production; Mechanical and equipment research and development; Mechanical and equipment sales: Mechanical and electrical equipment sales: Mechanical parts, Component sales; Machine part, Parts and processing; Machinery manufacturing for construction engineering; Machine sales for construction engineering: Auto parts wholesale; Auto parts retail; Automotive parts research and development; Automobile parts and accessories manufacturing: Rubber products sales: Mechanical and electrical equipment manufacturing: Special equipment manufacturing (excluding licensed professional equipment manufacturing): Casting machine sales; Non-ferrous metal casting: Seal sales: Metal products sales: Metal material manufacturing: Metal structure manufacturing: Gold structure sales; Non-ferrous metal alloy sales; Technical service, technological development, technical advisory work, exchange of know-how, technical transformation, technology transfer; Engineering and technical services (planning and management, reconnaissance, design, Except supervision): Oil drilling and production special equipment marketing: Oil and gas technical service: Labor service (excluding dispatch): Mechanical equipment leasing: Forest greening engineering workers; Earthwork construction: Import and export of goods: Import and export agent; Domestic trade agent: General goods storage services (excluding hazardous chemicals and other items requiring permission and approval); Sales of labor protection articles; Clothing and clothing for sale; Shoes and hats for sale; Leather products for sale. (Except for projects subject to approval according to law, business activities by business license) permitted projects: Land oil and gas exploitation; Construction projects.