Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4866642 | Method and apparatus for determining the diameter of rail vehicle wheels | Helmut Wittkopp, Nis-Friedrich Ewald | 1989-09-12 |
| 4861204 | Turn broaching tool | Garri Berstein, Helmut Wittkopp | 1989-08-29 |
| 4799839 | Method and apparatus for performing a rotary broaching operation particularly on work pieces of rotational symmetry | Garri Berstein, Helmut Wittkopp, Hermann Wolters | 1989-01-24 |