| Business | Phone |
| A & M Technical Svc 407 Sylvester Rd, Houston 77009 | (713) 691-1765 |
| Anderson & Assoc Inc 919 Fm 1959 Rd, Houston 77034 | (281) 481-5840 |
| Franklin Research Assoc 11354 Jones Rd W C, Houston 77065 | (281) 894-2245 |
| Houston Metallurgical Lab Inc 2400 Central Pkwy R, Houston 77092 | (713) 688-2777 |
| Inter Corr Intl 14503 Bammel N Houston Rd 300, Houston 77014 | (281) 444-2282 |