| Client name | City | Country |
|---|---|---|
| Continental Valves Limited | Sohna, Gurgaon | India |
| Control Valves UK Ltd. | Wigan | United Kingdom |
| Coperion Ideal Pvt. Ltd. | Noida | India |
| Cordenka GmbH & Co. KG | Obernburg | Germany |
| Corlido Procurement Services b.v. | Emmen | Netherlands |
| Corporate Solutions | Voest | Belgium |
| Covestro Antwerpen N.V. | Antwerpen | Belgium |
| Covestro Deutschland AG | Brunsbüttel | Germany |
| Covestro Polymers (China) Co., Ltd. | Shanghai | China |
| Crane Process Flow Technologies (India) Pvt Ltd | Pune | India |
| 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 |
| Cummins Inc. | Mississauga | Canada |
| CURRENTA GmbH & Co. OHG | Krefeld | Germany |
| CURRENTA GmbH & Co. OHG | Leverkusen | Germany |
| CURRENTA GmbH & Co. OHG | Leverkusen | Germany |
| CVM - Cie de Vannes & Moteurs | Venissieux | France |
| Cyient Engineering & Information GmbH | Oberursel | Germany |
| 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 | Italy |
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