| Business | Phone |
| Able Engineering 3605 Gagnon St, South Bend 46628 | (574) 289-7720 |
| Accurate Design 1117 Mishawaka Ave, South Bend 46615 | (574) 233-7896 |
| San Mar Inc 54555 Pine Rd, South Bend 46628 | (574) 232-6081 |
| Witt Engineering Co 2632 Fisher St, South Bend 46619 | (574) 232-7668 |