| Business | Phone |
| Proton Technology Group Inc 22122 Sherman Way # 303, Canoga Park 91303 | (818) 227-3555 |
| Spec Group Inc 6800 Owensmouth Ave, Canoga Park 91303 | (818) 592-6643 |
| Sukow Engineering 21201 Victory Blvd # 215, Canoga Park 91303 | (818) 654-0675 |
| Howard Engineering 21525 Parthenia St, Canoga Park 91304 | (818) 341-1019 |
| R D Grossman & Assoc 6948 Lena Ave, Canoga Park 91307 | (818) 346-3814 |