| Business | Phone |
| David A Burre Engineers Inc 11660 Alpharetta Hwy 100, Roswell 30076 | (770) 442-0500 |
| Edi 1241 Canton St, Roswell 30075 | (770) 640-0303 |
| Engineering & Inspection Systs 625 Hembree Pkwy B, Roswell 30076 | (770) 343-8800 |
| Infinigy Engineering Inc 810 Marietta Hwy, Roswell 30075 | (770) 640-9969 |
| Lce Engineers Inc 1255 Canton St, Roswell 30075 | (770) 998-5763 |