Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4811777 | Device for at least partly closing a vertical opening in a building and its use as a mechanical anti-freeze shutter | — | 1989-03-14 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4811777 | Device for at least partly closing a vertical opening in a building and its use as a mechanical anti-freeze shutter | — | 1989-03-14 |