- Alt & Witzig Engineering
- Belville Engineering Inc
- Blaeser Engineering Svc Inc
- C-It Design Inc
- Contech Design Inc
- Dasco Enterprises Inc
- Development Works
- Haley-Dusa Enginnering Group
- Jones-Warner Assoc
- QEI Engineers
- Reinke Group Inc
- Stan & Assoc Inc
- Summit Engineering
- Task Controls & Computers Co
- Utility Systs Engineering Inc
