| Business | Phone |
| Industrial Engineering Assoc 2500 Mccain Blvd # 205, North Little Rock 72116 | (501) 758-1171 |
| Rigsby Engineering 4306 Idlewild Ave, North Little Rock 72116 | (501) 753-5555 |
| Yelenich Engineering Svc 12017 Mundo Rd, North Little Rock 72118 | (501) 519-1300 |