| Business | Phone |
| C S Engineers 35746 Lakeland Blvd # 13, Willoughby 44095 | (440) 953-9878 |
| C T Consultants Inc 35000 Kaiser Ct # 100, Willoughby 44094 | (440) 951-9000 |
| Contract Consultants Inc 5000 E 345th St, Willoughby 44094 | (440) 946-1510 |
| Ggj Inc 34675 Melinz Pkwy, Willoughby 44095 | (440) 953-1567 |
| Leinweber Engineering 38038 2nd St, Willoughby 44094 | (440) 953-3580 |
| Tec Inc 33851 Curtis Blvd # 216, Willoughby 44095 | (440) 953-8760 |
| Technical Assurance Consulting 38112 2nd St, Willoughby 44094 | (440) 953-3147 |