| Client name | City | Country |
|---|---|---|
| ANDRITZ Energy & Environment GmbH | Wien | Austria |
| ANDRITZ Energy & Environment GmbH | Raaba/Graz | Austria |
| Anlagen und Engineering Büro GmbH | Magdeburg | Germany |
| Anshan Bell Automatic Controlling Co., Ltd. | Anshan | China |
| APPLY Poland Sp. z o.o. | Kraków | Poland |
| Arabian Gulf Oil Company | Benghazi, G.S.P.L.A.J | Libya |
| Aramco Overseas Company b.v. | The Hague | Netherlands |
| Arasin GmbH | Voerde | Germany |
| ARCA Regler GmbH | Tönisvorst | Germany |
| ArcelorMittal Belgium N.V. | Gent | Belgium |
| ArcelorMittal Bottrop GmbH | Bottrop | Germany |
| Argo-Anleg GmbH | Wesel | Germany |
| ARI-Armaturen | Schloß Holte-Stukenbrock | Germany |
| Armaghan Sanat Naft Co. | ||
| artec Armaturen und Industrieservice GmbH | Leegebruch | Germany |
| ARTELIA HOLDING | ECHIROLLES | France |
| ARTELIA Industrie | Le Havre Cedex | France |
| Artes Valve & Service GmbH | Velten | Germany |
| Arthur Steinebach GmbH | Nentershausen | Germany |
| ARVOS GmbH | Düsseldorf | Germany |
| ARVOS GmbH | Kassel | Germany |
| Arxada AG | Visp | Switzerland |
| Arya Engineers & Contractors Pvt. Ltd. | PUNE | India |
| ASV Stübbe GmbH & Co. KG | Vlotho | Germany |
| Atlas Copco Airpower NV | Wilrijk | Belgium |
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