| 1929 | Establishment in Hamburg by Alfons Köster and Willy Julius on 1st October. |
| 1970 | Fritz Wessel joins the company as partner |
| 1978 | Establishment of the GmbH (Ltd.) |
| 1982 | Establishment of the branch in Stuttgart |
| 1985 | Establishment of the branch in Frankfurt |
| 2000 | Olaf Wessel, Frank Wessel and Heinz Losert are appointed as further presidents. |
| 2003 | Establishment of the branch in Düsseldorf |
| 2009 | Panagiotis Vasilopoulos is appointed as president |
| 2010 |
Establishment of the branch in Shanghai Establishment of the branch in Bremen |
| 2013 | Establishment of the branch in Tauberbischofsheim |
| 2014 | Establishment of the branch in Munich |
