| Business | Phone |
| Ade Corp 1202 E Arapaho Rd 101, Richardson 75081 | (972) 907-1300 |
| Applied Infra-Red Technology 1402 Concord Dr, Richardson 75081 | (972) 644-7334 |
| Emerson Power Transmission 1701 N Greenville Ave 1111, Richardson 75081 | (469) 916-3100 |
| Universal Instruments Corp 1222 E Arapaho Rd, Richardson 75081 | (972) 699-7063 |