| Business | Phone |
| Aes Corp 1930 Saint Andrews Ct Ne, Cedar Rapids 52402 | (319) 395-7751 |
| Pct Inc 280 50th Ave Sw, Cedar Rapids 52404 | (319) 366-5878 |
| Pinnacle Engineering 1000 27th Ave Sw, Cedar Rapids 52404 | (319) 896-4306 |
| R J Engineering Systems Inc 849 33rd Ave Sw, Cedar Rapids 52404 | (319) 396-5470 |