Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4510687 | Shaving apparatus | Atze de Haan, Hendrik Poel, Eduard W. Tietjens, Jochem J. de Vries | 1985-04-16 |
| 4424628 | Shaving apparatus | Eduard W. Tietjens | 1984-01-10 |
| 4275497 | Shaving apparatus | Manfred Engelhardt, Jan Reinink, Jochem J. de Vries, Ferdinand M. Trees, Eduard W. Tietjens | 1981-06-30 |
| 4259781 | Shaving apparatus | Ebbe Boiten, Jochem J. de Vries | 1981-04-07 |