| Business | Phone |
| Engineering Industries Ltd 6323 S Santa Fe Dr, Littleton 80120 | (303) 797-9185 |
| Hinz Automation Inc 8920 Barrons Blvd # 107, Littleton 80129 | (303) 740-7555 |
| Alber Engineering Inc 10499 Bradford Rd # 102, Littleton 80127 | (303) 985-3260 |
| Browns Hill Engineering 8871 S Ammons St, Littleton 80128 | (720) 344-7771 |
| E Squared Power Systems Inc 7961 Shaffer Pkwy # 2, Littleton 80127 | (303) 988-6659 |
| Glen A Clayden & Assoc Inc 2753 W Riverwalk Cir, Littleton 80123 | (303) 347-9826 |