Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7681693 | Method for performing an elevator rescue run | Dirk H. Tegtmeier, Herbert K. Horbruegger, Michael Mann | 2010-03-23 |
| 7549515 | Electrical elevator rescue system | Dirk H. Tegtmeier | 2009-06-23 |