| Client name | City | Country |
|---|---|---|
| MiRO Mineraloelraffinerie Oberrhein GmbH & Co. KG | Karlsruhe | Germany |
| MiRO Mineralölraffinerie Oberrhein GmbH & Co. KG | Karlsruhe | Germany |
| Mitsubishi Power Europe GmbH | Duisburg | Germany |
| MMEC Mannesmann GmbH | Düsseldorf | Germany |
| Modulare Planungs- und Konstruktionstechnik GmbH | Köln | Germany |
| mopran GmbH | Butzbach | Germany |
| Moritz J. Weig GmbH & Co. KG | Mayen | Germany |
| müller co-ax ag | Forchtenberg | Germany |
| müller quadax gmbh | Forchtenberg | Germany |
| MVV Enamic IGS Gersthofen | Gersthofen | Germany |
| N+S GmbH & Co. KG | Gelsenkirchen | Germany |
| Neckarwerke Stuttgart AG | Stuttgart | Germany |
| Neptune Energy Deutschland GmbH | Lingen/Ems | Germany |
| Nino | Nordhorn | Germany |
| Nippon Gases Deutschland Holding GmbH | Hürth | Germany |
| NNE Pharmaplan GmbH | Bad Homburg | Germany |
| Nobian GmbH | Ibbenbüren | Germany |
| Nobian GmbH | Frankfurt am Main | Germany |
| Noell-LGA Gastechnik GmbH | Remagen | Germany |
| NOPA Industriearmaturen GmbH Eisenhüttenstadt | Eisenhüttenstadt | Germany |
| Nord-West Kavernengesellschaft mbH | Wilhelmshaven | Germany |
| Nouryon Industrial Chemicals | Frankfurt am Main | Germany |
| NUKEM Technologies Engineering Services GmbH | Alzenau | Germany |
| NUKEM Technologies GmbH | Alzenau | Germany |
| Nuplex Resins GmbH | Bitterfeld Wolfen | Germany |
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