1. K-Line Insulators, Rochester, NY, USA
2. K-LINE Insulators, Toronto, ON, Canada
3. Hubbell Power Systems, Wadsworth, OH, USA
4. Power Engineers, Lakewood, CO, USA
5. NGK-Locke Polymer Insulators, Inc., Virginia Beach, VA, USA
6. Xcel Energy Services, Inc., Minneapolis, MN, USA
7. American Transmission Company, Waukesha, WI, USA
8. MacLean Power Systems, Fort Mill, SC, USA
9. Electric Power Research Institute, Charlotte, NC, USA
10. Lapp Insulators, LLC., Le Roy, New York, NY, USA