| Client name | City | Country |
|---|---|---|
| Danieli Corus Europe BV | Velsen Noord | Netherlands |
| Daqing Petrochemical Engineering Co., Ltd. | Daqing | China |
| Datalog Software AG | München | Germany |
| DAUMAC Steuer- u. Regelventile GmbH | Dornham-Weiden | Germany |
| Daume Regelarmaturen GmbH | Isernhagen | Germany |
| De Jong Combustion b.v. | Schiedam | Netherlands |
| De Pretto Industrie S.r.l. | Schio | Italy |
| De Smet AGRO s.a. | Mont-Saint-Guibert | Belgium |
| Deepak Fertilizers & Petrochemicals Corporation Ltd. | Taloja, Raigad | India |
| Degussa AG | Hanau-Wolfgang | Germany |
| Delta Control Gesellschaft für Automation mbH | Köln | Germany |
| Deltafluid S.A.R.L. | Lacq | France |
| Dembla Valves Ltd. | Thane - Bhiwandi | India |
| descote s.a.s | Feyzin | France |
| Dette | Wuppertal | Germany |
| Deutsche Babcock Werke AG | Oberhausen | Germany |
| Deutsche Engineering d.Voest | Essen | Germany |
| Deutsche Infineum GmbH | Köln | Germany |
| Deutsche Steinkohle Kokerei Prosper | Bottrop | Germany |
| Dipl. Ing. Heinrich - Wilhelm Ott | Hammerfest | Norway |
| Dipl.Ing. Dkfm. Edtmayer GmbH | Wien | Austria |
| Diro Atlantique | Saint Jean D’Illac | France |
| DMT GmbH & Co. KG | Essen | Germany |
| DMV International | Veghel | Netherlands |
| Donaldson Filtration Deutschland GmbH | Haan | Germany |
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