- Alternative Vehicle Svc Group
- Bergquist Inc
- Chandler Engineering
- Combustion Services
- Crosstex Energy Svc
- Crosstex Energy Svc
- Custom Energy Construction
- Dynegy Parts & Technical Svc
- Dynegy Parts & Technical Svc
- Ely Energy Inc
- Ferrellgas
- Ferrellgas
- Gardner-Marsh Gas Equipment
- Gas Alternative Systems
- Gas Alternative Systems
- Gas America
- Gas Applications Specialties
- Gas Equipment Co Inc
- Gas Equipment Co Inc
- Gas Separation Technology
- Gas Technology Corp
- Gas Technology Corp
- Gas Turbine Efficiency
- Gas Turbine Efficiency
- Great Lakes Petroleum Svc
- GSM Inc
- Guyco Equipment
- Ignition Systems & Control
- L P Gas Industrial Equipment
- Machemco Inc
- Midwest Energy Inc
- Natural Gas Equipment Svc Inc
- Newpoint Gas Svc Inc
- Nordco Marketing Inc
- Oil & Gas Systems Design Co
- Q B Johnson Mfg Inc
- S E Corp
- S E Corp
- South-Tex Treaters Inc
- Standby Systems Inc
- Upsco Inc
- Vectren