| Business | Phone |
| E H Engineering Ltd 3333 Cleveland Ave 4, Lincoln 68504 | (402) 466-6720 |
| Huffman Engineering Inc 5301 N 57th St, Lincoln 68507 | (402) 464-6823 |
| Noel Engineering 4723 Prescott Ave, Lincoln 68506 | (402) 483-5683 |
| Zoex Corp 211 N 44th St # 315, Lincoln 68503 | (402) 475-7640 |