| Client name | City | Country |
|---|---|---|
| Lurgi Metallurgi GmbH | Frankfurt | Germany |
| M+W Central Europe GmbH | Schwedt/Oder | Germany |
| m-tech gmbh | Forchtenberg | Germany |
| Magdeburger Industriearmatur-Manufaktur GmbH | Magdeburg | Germany |
| MAGWEN Valves GmbH | Osterweddingen | Germany |
| Mahler AGS GmbH | Stuttgart | Germany |
| MAKE IT GmbH | Chemnitz | Germany |
| MAN Energy Solutions SE | Oberhausen | Germany |
| MAN GHH | Geisenheim | Germany |
| MAN Gute Hoffnungshütte AG | Oberhausen | Germany |
| Mankenberg GmbH | Lübeck | Germany |
| Mannesmann Demag Hüttentechnik | Mönchengladbach | Germany |
| Märkische Faser AG | Premnitz | Germany |
| Martin GmbH | München | Germany |
| Martinswerk GmbH | Bergheim | Germany |
| Maschinenbau Scholz GmbH & Co. KG | Coesfeld | Germany |
| Maschinenfabrik Neuman & Esser GmbH & CoKG | Übach-Palenberg | Germany |
| Maximator Hydrogen GmbH | Nordhausen | Germany |
| McPhy Energy Deutschland GmbH | Wildau | Germany |
| ME Engineering GmbH | Marl | Germany |
| Merck KGaA | Darmstadt | Germany |
| Messer SE & Co. KGaA | Bad Soden | Germany |
| Metra Energie Messtechnik GmbH | Speyer | Germany |
| Metso Automation GmbH | Leverkusen | Germany |
| Microflex Services GmbH | Hamburg | Germany |
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