Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4840249 | Apparatus for srewing a cover onto a screw neck of a hearing aid | Christof Haertl, Peter Nassler | 1989-06-20 |
| 4834927 | Method and apparatus for producing an ear impression | Christof Haertl, Peter Nassler | 1989-05-30 |
| 4828777 | Method and apparatus for the manufacture of an otoplastic shell | — | 1989-05-09 |