Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4832017 | Breathing mask | — | 1989-05-23 |
| 4829603 | Protective suit having a zipper openable with a pull guide | Dieter Gronwoldt | 1989-05-16 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4832017 | Breathing mask | — | 1989-05-23 |
| 4829603 | Protective suit having a zipper openable with a pull guide | Dieter Gronwoldt | 1989-05-16 |