Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861204 | Turn broaching tool | Hans W. Obrig, Helmut Wittkopp | 1989-08-29 |
| 4799839 | Method and apparatus for performing a rotary broaching operation particularly on work pieces of rotational symmetry | Hans W. Obrig, Helmut Wittkopp, Hermann Wolters | 1989-01-24 |