| Business | Phone |
| G E 300 Riverhills Business Park, Birmingham 35242 | (205) 991-4219 |
| Electric Controls & Svc 5639 Miller Industrial Blvd, Birmingham 35210 | (205) 833-9900 |
| Crs Engineering Inc 3504 7th Ave S, Birmingham 35222 | (205) 323-2373 |
| Henson Engineering Inc 2829 2nd Ave S # 310, Birmingham 35233 | (205) 324-0030 |
| Hyde Engineering 158 Business Center Dr, Birmingham 35244 | (205) 982-0900 |
| Jackson Renfro & Assoc Inc 141 Village St # 1, Birmingham 35242 | (205) 995-1078 |