Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4841689 | Two-shell telescopic element | — | 1989-06-27 |
| 4833840 | Telescoping wall element of a movable partition | Rolf Kalischewski, Gerd Petersen | 1989-05-30 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4841689 | Two-shell telescopic element | — | 1989-06-27 |
| 4833840 | Telescoping wall element of a movable partition | Rolf Kalischewski, Gerd Petersen | 1989-05-30 |