| Business | Phone |
| Circuit Check 1001 S Sherman St, Richardson 75081 | (972) 480-0044 |
| Electro Scientific Industries 681 N Plano Rd, Richardson 75081 | (972) 699-7402 |
| Scientific Test 1110 E Collins Blvd # 130, Richardson 75081 | (972) 487-9421 |
| Semi Tek Inc 408 N Bowser Rd, Richardson 75081 | (972) 783-8100 |
| Teradyne Inc 1840 N Greenville Ave 128, Richardson 75081 | (972) 231-5384 |
| Wandel & Goltermann Inc 990 N Bowser Rd, Richardson 75081 | (972) 231-8923 |
| Testronics 1800 N Glenville Dr 136, Richardson 75081 | (972) 542-3111 |