| Business | Phone |
| Advanced Technologies-Michigan 37651 Schoolcraft Rd, Livonia 48150 | (734) 953-5034 |
| Intertek Etk Semko 35550 Industrial Rd, Livonia 48150 | (734) 591-9161 |
| Paragon Laboratories 12649 Richfield Ct, Livonia 48150 | (734) 462-3900 |
| Research Technologies Intl 31628 Glendale St, Livonia 48150 | (734) 422-8000 |
| L & L Assoc 39111 6 Mile Rd, Livonia 48152 | (734) 953-2420 |
| K-Tech Environmental Conslnts 19500 Middlebelt Rd, Livonia 48152 | (248) 426-7600 |
| Mitsubishi Engineering Plstcs 17526 N Laurel Park Dr, Livonia 48152 | (734) 464-6957 |
| Michigan Metrology 17199 N Laurel Park Dr 51, Livonia 48152 | (734) 953-5030 |
| Mitchell's Granite Plate 35958 Middleboro St, Livonia 48154 | (734) 591-1377 |