| Business | Phone |
| Etscheid Duttlinger & Assoc 1304 Gemini Cir, Ottawa 61350 | (815) 434-3925 |
| Mcclue Engineering Assoc Inc 1138 Columbus St, Ottawa 61350 | (815) 932-7430 |
| Pantrol Inc 1510 Chestnut St, Ottawa 61350 | (815) 434-7500 |
| Robinson Engineering Ltd 628 Columbus St, Ottawa 61350 | (815) 433-0400 |