| Business | Phone |
| Graybar Electric Co 383 Cheryl Ln, Walnut 91789 | (909) 451-4300 |
| King Bright Usa 225 Brea Canyon Rd, Walnut 91789 | (909) 468-0500 |
| Sunled Corp 20793 Valley Blvd # C, Walnut 91789 | (909) 598-8266 |
| Advanced Magnetic Components 671 Brea Canyon Rd, Walnut 91789 | (909) 444-7722 |
| E Preview Corp 22042 Roundup Dr, Walnut 91789 | (909) 598-4978 |
| Graybar Electric Co 383 Cheryl Ln, Walnut 91789 | (909) 451-4600 |
| Harmon Technology Inc 376 Lemon Creek Dr # G, Walnut 91789 | (909) 598-8873 |
| Lava Electronics Inc 245 Paseo Sonrisa, Walnut 91789 | (909) 444-4650 |
| Tecnew Usa Inc 20451 Valley Blvd, Walnut 91789 | (909) 839-0688 |