• JOFCO
• Johnson Pumps
• Kentucky Utility
• Kosmos Cement
• Light Engineering, Inc.
• Louisville Gas & Electric Company
• Mohler Electric
• North American Stainless
• Novelis Corporation
• Omaha Public Power District
• Owensboro Municipal Utilities
• Process Equipment
• Project Associates
• Rexam
• Rolls-Royce
• Southdown-Kosmos Cement
• St. John River Power Park
• Toledo Edison
• Toyota
• TXI Cement
• United States Treasury Dept.
• US Steel
• US Turbine
• Vectren
• Vibration Institute
• Western Kentucky Utilities