| Business | Phone |
| Foster Engineering Co 30941 Agoura Rd # 222-224, Westlake Village 91361 | (818) 991-9971 |
| Transamerican Consultant Engrg 30961 Agoura Rd, Westlake Village 91361 | (818) 889-9986 |
| Consulting West 31340 Via Colinas # 102, Westlake Village 91362 | (818) 889-3383 |
| Digital Energy 128 Auburn Ct # 106, Westlake Village 91362 | (805) 374-1777 |
| Matech 31304 Via Colinas # 102, Westlake Village 91362 | (818) 991-8500 |
| Optim Microwave Inc 31300 Via Colinas, Westlake Village 91362 | (818) 865-8157 |