- Almaza (Libanon)
- Amberger Kühltechnik (Germany)
- A+P Kieffer (Luxembourg)
- Audi (Germany)
- Bassin de Rhodenbeek (Belgium)
- Beiersdorf (Germany)
- Bitburger (Germany)
- Brau-Union (Austria)
- Caverion (Germany)
- Climalux (Luxembourg)
- Disun (Hongkong)
- Dürr (world-wide)
- Elco (Luxembourg)
- Elias Ghali & Sons (Syria)
- E3-Killian Inc. (USA)
- FEV Motorentechnik (Germany, China)
- Ford, Deutschland (USA)
- Glaum (Germany)
- Grencobell (Belgium)
- Haden (Great Britain)
- Henkell (Germany)
- Hutchinson (Germany, France)
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- Ikea Istanbul (Turkey)
- Impremerie Quebecor (France, Canada)
- Imtech (Germany)
- Krombacher (Germany)
- Linde (Austria)
- Linde-Sarca (Luxembourg)
- Mapa in Liancourt (France)
- Norit (Netherlands)
- Opel (Germany)
- Praxair (Spain)
- Procter & Gamble (world-wide)
- Roses (Germany)
- Toyota (France)
- Truss Haustechnik (Germany)
- VA Tech Elin Inc. (USA)
- Vistion (France)
- Volkswagen (Germany)
- Warsteiner (Germany)
- Witt Kältemaschinen (Germany)
- Wolfferts (Germany)
- York International (Czech Republic)
- Zarifopoulos S.A. (Greece)
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