| Business | Phone |
| Applied Engineering Concept 1105 N Allen Ave, Pasadena 91104 | (626) 398-3052 |
| Calpec Engineering Co 2500 E Colorado Blvd # 250, Pasadena 91107 | (626) 792-8382 |
| Palmieri & Assoc Inc 232 N Lake Ave, Pasadena 91101 | (626) 440-1313 |
| Prama Corp 107 S Fair Oaks Ave, Pasadena 91105 | (626) 395-0634 |
| Texcal Llc Pasadena 91105 | (626) 441-8531 |
| Wittry Associates Consulting Pasadena 91104 | (626) 398-9624 |