- ABB Power T&D Company
- Alcoa Inc.
- Ametek Solidstate Controls Inc.
- Atlantic Research
- Babcock & Wilcox Company
- Borgwarner Automotive
- Cummins Engine Company Inc.
- Corning Inc.
- Danfoss Fluid Power
- Danmar Industries Inc.
- Delphi Korea
- Delta Unibus Corporation
- Doosan Infracore
- Flowserve Pump Division
- Fluid-Power Equipment Inc.
- GE Appliances
- GE Toshiba Automation Systems
- General Electric
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- Hunter Engineering Company
- Husco International Inc.
- Hyundai Heavy Industries
- Ingersoll Rand Company
- Krenz & Company Inc.
- Lightning Eliminators and Consultants Company
- Lucas-Milhaupt Inc.
- Key Safety
- Magnetrol International Inc.
- Natco Group Inc.
- Oilstates Industries Inc.
- Penberthy/Tyco Valves & Controls
- Powell Electric Manufacturing Company
- Puffer-Sweiven Specialties
- Siemens Energy & Automation Inc.
- Siemens Westinghouse Power Corporation
- Solar Turbines International Company
- Unicel Inc.
- Universal Compression Company
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