Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4587965 | Ear protector for keeping down sound and associated filter | Karel J. Doorduin | 1986-05-13 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4587965 | Ear protector for keeping down sound and associated filter | Karel J. Doorduin | 1986-05-13 |