Approvals by customers
| Preferred Supplier of the Bosch Group in the material group Steel | [EN] |
| LISEGA SE - ASME Sec. III - Witten, Siegen, Hagen, Krefeld | [DE/EN] |
| Deutsche Bahn AG - Witten | [EN] |
| Supplier Approval of the Schaeffler group (FAG, INA und LUK) (For the DEW plant Witten/Krefeld) | [EN] |
| Supplier Approval of the Schaeffler group (For the DEW plant Siegen) | [EN] |
| Formel Q Volkswagen Aktiengesellschaft (DEW plant Siegen) | [DE] |