Petroleum refining and manufacture and sale of oil products
Manufacture and sale of petrochemical products
Exploration, development, and extraction of petroleum, coal, geothermal resources, and other mineral resources
Manufacture of agricultural chemicals, agricultural materials, and other chemicals
Development, manufacture, and sale of functional electronic materials
Design, installation, fabrication, and sale of various machinery, equipment, and devices for chemical-industrial and environmental-protection uses
Real-estate sales, leasing, and management
Computer-software development, sales, and consulting