Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4343086 | Shaving apparatus | Jochem J. de Vries | 1982-08-10 |
| 4275497 | Shaving apparatus | Manfred Engelhardt, Jan Reinink, Jochem J. de Vries, Eduard W. Tietjens, Gerrit J. Groothuis | 1981-06-30 |
| 4261101 | Shaving apparatus with lead cutter | Eduard W. Tietjens | 1981-04-14 |