| Business | Phone |
| Electronic Contracting Co 6501 N 70th St, Lincoln 68507 | (402) 341-2780 |
| Electronic Sound Inc Lincoln 68504 | (402) 465-5955 |
| Sanctified Sound Enterprises 1800 Spring Meadow Dr, Lincoln 68521 | (402) 440-2528 |
| Watts Systems Lincoln 68508 | (402) 474-9708 |