| Kundenname | Stadt | Land |
|---|---|---|
| Walcher Meßtechnik GmbH | Kirchzarten | Germany |
| Waldemar Pruss Armaturenfabrik GmbH | Hilden | Germany |
| Waldemar Pruss Armaturenfabrik GmbH | Hannover | Germany |
| Walter Stenzenberger | München | Germany |
| Walthon Weir Pacific S.A. | Zaragoza | Spain |
| Weber Engineering GmbH & Co. KG | Dortmund | Germany |
| Weber Engineering GmbH & Co. KG | Pulheim | Germany |
| Wehrle-Werk AG | Emmendingen | Germany |
| Weir Valves & Controls | Huddersfield | United Kingdom |
| Weisz Andina S.A.S | Cajica | Colombia |
| WEKA AG | Bäretswil | Switzerland |
| Welland & Tuxhorn AG | Bielefeld | Germany |
| Welter, Thomas | Weilerswist | Germany |
| Westfälische Hochschule | Gelsenkirchen | Germany |
| Westlake US 2 LLC | Houston | United States |
| Westlake US 2 LLC | Westlake | United States |
| Westlake Vinnolit GmbH & Co. KG | Hürth | Germany |
| WeylChem Frankfurt GmbH | Frankfurt | Germany |
| Wiener Netze GmbH | Wien | Austria |
| WIG Industrieinstandhaltung Leuna | Leuna | Germany |
| WIKA Process Solutions India Pvt. Ltd. | Prithla | India |
| Wilhelmshavener Raffineriegesellschaft mbH | Wilhelmshaven | Germany |
| Wilson UK Ltd. | Gorleston | United Kingdom |
| Wintershall Holding GmbH | Kassel | Germany |
| Wintershall Noordzee B.V. | Rijswijk | Netherlands |
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