| Business | Phone |
| Black & Veatch 125 Ottawa Ave Nw 380, Grand Rapids 49503 | (616) 459-2360 |
| Cascade Engineering 3710 Sysco Ct Se, Grand Rapids 49512 | (616) 942-8516 |
| Grp Engineering Inc 660 Cascade West Pkwy Se 65, Grand Rapids 49546 | (616) 942-7183 |
| Image Cam & Engineering 2136 Coit Ave Ne, Grand Rapids 49505 | (616) 293-2039 |
| J Mark Systems Inc 701 3 Mile Rd Nw, Grand Rapids 49544 | (616) 784-6005 |
| Jhk Engineering 312 Bristol Ave Nw, Grand Rapids 49504 | (616) 453-7419 |
| Lmm Technologies Llc 1148 Fallingbrook Dr Se, Grand Rapids 49508 | (616) 281-1795 |
| Three 60 Co 801 Broadway Ave Nw # 448, Grand Rapids 49504 | (616) 459-5366 |
| Three 60 Productions 38 Fulton St W 400, Grand Rapids 49503 | (616) 988-3908 |
| Rapid Die & Engineering 2424 E Collier Ave Se, Grand Rapids 49546 | (616) 285-7158 |
| Practical Controls 61 Packard Ave Se, Grand Rapids 49503 | (269) 793-0175 |
| Nittany Engineering 2651 Ardmore St Se, Grand Rapids 49506 | (616) 954-9746 |