Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4827613 | Shaving apparatus | — | 1989-05-09 |
| 4811483 | Dry-shaving apparatus with self adjusting blades | Eduard W. Tietjens | 1989-03-14 |
| 4811484 | Dry-shaving apparatus | Willem Sjouke Wijma, Eduard W. Tietjens, Albert Hoekstra | 1989-03-14 |