1. 3M Company
2. BLOOD HOUND
LLC
3. Emerson Electric Co.
4. Graybar Electric Company Inc.
5. Ground Penetrating Radar Systems
LLC
6. Guideline Geo
7. Leica Geosystems AG
8. multiVIEW Locates Inc.
9. Radiodetection Ltd.
10. RYCOM Instruments Inc.
11. Stake Center Locating Inc.
12. Subsite Electronics by The Charles Machine Works Inc.
13. US Radar Inc.
14. USIC
15. Vermeer Corporation
16. Vivax-Metrotech Corp.