| Business | Phone |
| Cardinal Engineering Inc 6520 N Western Ave # 206, Oklahoma City 73116 | (405) 842-1066 |
| Weston Solutions Inc 620 N Robinson Ave # 203, Oklahoma City 73102 | (405) 270-1759 |
| Standard Testing Inc 4300 N Lincoln Blvd, Oklahoma City 73105 | (405) 424-8378 |