| Client name | City | Country |
|---|---|---|
| ThyssenKrupp Industrial Solutions AG | Dortmund | Germany |
| ThyssenKrupp Industrial Solutions AG | Bad Soden / Taunus | Germany |
| ThyssenKrupp nucera AG & Co. KGaA | Dortmund | Germany |
| Thyssenkrupp Steel Europe AG | Duisburg | Germany |
| ThyssenKrupp Uhde GmbH | Dortmund | Germany |
| ThyssenKrupp Uhde GmbH | Dortmund | Germany |
| ThyssenKrupp Uhde GmbH | Bochum | Germany |
| Ticona GmbH | Sulzbach | Germany |
| Ticona GmbH | Oberhausen | Germany |
| TotalEnergies Raffinerie Mitteldeutschland GmbH | Leuna | Germany |
| TPI GmbH | Braunschweig | Germany |
| Trei GmbH | Stuttgart | Germany |
| TRIPLAN AG Gelsenkirchen | Gelsenkirchen | Germany |
| TRIPLAN GmbH | Leverkusen | Germany |
| TRIPLAN GmbH | Karlsruhe | Germany |
| TTP GmbH | Rosenheim | Germany |
| TURN2X | München | Germany |
| TÜV Nord Systems GmbH & Co. KG | Bremen | Germany |
| TÜV Nord Systems GmbH & Co. KG | Essen | Germany |
| TÜV Süd Industrieservice GmbH | Traunreut | Germany |
| Tyczka Hydrogen GmbH | Geretsried | Germany |
| Uhde High Pressure Technologies GmbH | Hagen | Germany |
| Union Kraftstoff AG | Wesseling | Germany |
| UNIPER IT GmbH | Düsseldorf | Germany |
| Uniper Technologies | Gelsenkirchen | Germany |
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