| Industrial |
- Air Liquide America, LP
- Air Products and Chemicals
- Austin White Lime Company
- BP Energy Company
- CITGO Refining & Chemicals Company, LP
- Equistar Chemicals, Inc.
- ExxonMobil Power and Gas Services, Inc.
- Flint Hills Resources, LP
- Halliburton Energy Services
- Marathon Oil Company
- National Semiconductor Corporation
- Nucor Corporation
- Occidental Chemical Corporation
- SMI-Texas, Inc.
- Texas Industries, Inc.
- Texas Lehigh Cement Company, LP
- The Dow Chemical Company
- Ticona Polymer Limited
- Valero Energy Corporation
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