| Business | Phone |
| International Alliance Group 3657 Briarpark Dr 2, Houston 77042 | (713) 690-9050 |
| Marchfield Engineering 2500 Citywest Blvd, Houston 77042 | (713) 267-2227 |
| Anderson Engineering Co 910 Travis St, Houston 77002 | (713) 659-4463 |
| Gastech Engineering Corp 11111 Katy Fwy, Houston 77079 | (713) 973-5723 |
| M Eb Engineering 7233 Avenue F, Houston 77011 | (713) 926-5894 |
| Hilltop Construction & Engnrng 10101 Harwin Dr, Houston 77036 | (713) 778-4137 |
| Image Custom Engrg Solutions 10690 Shadow Wood Dr # 101, Houston 77043 | (713) 468-3330 |