| Business | Phone |
| E A Engineering 405 State Highway 121 Byp, Lewisville 75067 | (972) 315-5181 |
| Homeyer Engineering Inc 206 Elm St, Lewisville 75057 | (972) 906-9985 |
| Infrared Engineering 195 E Round Grove Rd # 1431, Lewisville 75067 | (972) 547-4632 |
| D B Design Solutions Lp 131 Degan Ave, Lewisville 75057 | (972) 434-5100 |