| Client name | City | Country |
|---|---|---|
| CTCI Beijing Co., Ltd. | Beijing | China |
| CTCI Corporation | Taipei | Taiwan, Province of China |
| Cummins (China) Investment Co., Ltd. | Wuhan | China |
| Cummins Hydrogen Technology (Shanghai) Co., Ltd. | Shanghai | China |
| CURRENTA GmbH & Co. OHG | Leverkusen | Germany |
| CURRENTA GmbH & Co. OHG | Krefeld | Germany |
| CURRENTA GmbH & Co. OHG | Leverkusen | Germany |
| CVM - Cie de Vannes & Moteurs | Venissieux | France |
| Dahl Sverige AB | Trollhättan | Sweden |
| Dalian Hengli Measure & Control Instrument Engineering Co.,L | Dalian | China |
| Dana Petroleum Netherlands B.V. | The Hague | Netherlands |
| Danfoss Regler GmbH | Stutensee | Germany |
| DANIELI & C. Officine Meccaniche SpA | Buttrio (UD) | Italy |
| 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 (Vi) | Italy |
| De Smet AGRO s.a. | Mont-Saint-Guibert | Belgium |
| 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 |
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