| Business | Phone |
| Ashton Engineering Inc 1225 E River Dr 310, Davenport 52803 | (563) 324-3224 |
| Convenient Technologies Po Box 6, Davenport 52805 | (563) 326-3590 |
| Mc Clure Engineering Assoc 1225 E River Dr 106, Davenport 52803 | (563) 322-2421 |
| Raymond Professional Group Inc 1222 E 37th St, Davenport 52807 | (563) 386-0517 |
| Townsend Engineering 2224 E 12th St, Davenport 52803 | (563) 386-4236 |