| 1. Halliburton (Halliburton Company Germany GmbH) in Celle |
|
| 2. TIB Chemicals (TIB Chemicals AG) in Mannheim |
|
| 3. Kipp & Grünhoff (Kipp & Grünhoff GmbH & Co. KG) in Leverkusen |
|
| 4. Nalco Water (Nalco Deutschland GmbH) in Monheim am Rhein |
|
| 5. Vantage Leuna (Vantage Leuna GmbH) in Leuna |
|