- Apache Corp
- Baker Oil Tools
- C S Oil & Gas LTD
- Charles
- Dehlinger Oil & Gas Inc
- Enron Oil & Gas Co
- Greasewood Oil Co
- Houghton Oil Co
- Jack C Cartwright
- KERR-Mc Gee Oil & Gas Corp
- Mc Cann Corp
- Miranda Energy Corp
- Oxy Permain
- Prime Operating Co
- Reliance Energy Inc
- Richmond Drilling Co
- Robert B Holt
- Robert B Holt
- ROC Energy Inc
- Shenandoah Petroleum Corp
- Wilson Systems Inc