Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6847292 | Method and device for remote unlocking of an access door of a building with an elevator | — | 2005-01-25 |
| 5844180 | Equipment for the production of elevator shaft information | Christoph Liebetrau | 1998-12-01 |