| Business | Phone |
| Evans Miller Engineering Inc 2274 Azalea Dr, Lawrenceville 30043 | (678) 985-2309 |
| Primco Engineering Co 333 Swanson Dr, Lawrenceville 30043 | (678) 985-1778 |
| Medical Design Inc 1251 Eugenia Ter, Lawrenceville 30045 | (770) 962-7795 |
| Kiser Engineering 930 Hounds Ridge Ct, Lawrenceville 30043 | (770) 963-5600 |