- A & L Engineering
- A & L Engineering
- ACEI
- Apex Design Technology Inc
- Beartech 2000 Inc
- Beartech 2000 Inc
- C A Huff & Assoc Engineers
- C A Huff & Assoc Engineers
- CEC Inc
- Charles Engineering Intl
- D T Huffman & Assoc
- D T Huffman & Assoc
- D T Huffman & Assoc
- G S Drive Products
- Group B Inc
- Group B Inc
- Harbour Engineering
- Harbour Engineering
- Hargrove & Associates
- Hill Engineering
- Industrial Equipment Builders
- J B Delaney & Assoc
- John Barry & Assoc
- John Barry & Assoc
- John Vorris Industrial Engr
- Kittell Engineering
- Krauss-Maffei Corp
- Level 3 Engineering
- Level 3 Engineering
- Methods
- Mobius Technologies
- Olde Thompson
- OME Inc
- Pascal & Ludwig Engineers
- Resources Management Group
- Specialty Controls
- Specialty Engineering
- Thomas Engineering Consultants
- Trans Systems Corp
- W R Phelps Engineering Inc
- Wheelabrator Engineered System
