- Advanced Solutions Inc
- American Technology & Svc
- Belcan Corp
- Dennmark Consultants Inc
- Dennmark Consultants Inc
- Designeers Midwest
- E-Prime
- ERM
- ESSC Inc
- Hazen & Sawyer
- J T King & Co Inc
- Jacobsen Automation Group
- Lee Knuppel & Assoc
- Lockwood Greene Engineers Inc
- Material Tech Solutions Co
- Maverick Corp
- Payne Firm Inc
- R W Beck
- SAEC
- Stand Co
- TECHNICAL Solution Specialists
- V L Engineering
- Wang Engineering Inc
- XCG Consultants Inc
