| Business | Phone |
| Trimark Engineering 3201 S Cobb Dr Se, Smyrna 30080 | (770) 319-1423 |
| Southwest Signal Engineering 1850 Lake Park Dr Se 216, Smyrna 30080 | (770) 801-0051 |
| Kennedy Engeerning & Assoc Grp 610 Lismore Se, Smyrna 30080 | (770) 933-9110 |
| Stahlman Engineering Corp 4731 Camp Highland Rd Se, Smyrna 30082 | (770) 435-1717 |
| Batlground Engineering 1770 Atlanta Rd Se, Smyrna 30080 | (770) 319-9605 |