| Business | Phone |
| Westin Engineering Inc 1164 Clarendon Dr, Marietta 30068 | (770) 650-9181 |
| Curry Controls Co 2030 Powers Ferry Trce Se, Marietta 30067 | (770) 690-9460 |
| Saw Controls Inc Marietta 30062 | (770) 973-8004 |
| Idm Control Inc 1710 Cumberland Point Dr 16, Marietta 30067 | (770) 953-9631 |
| Process Measurement & Control 117 Barber Rd Se, Marietta 30060 | (770) 857-0003 |
| Alc Systems Integration Group 1800 Sandy Plains Pkwy 216, Marietta 30066 | (770) 427-7443 |
| Automated Technical Svc 3952 Casteel Ct Sw, Marietta 30064 | (770) 321-1270 |