Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4289357 | Hollow cutting head | Alfred Zitz, Otto Schetina, Herwig Wrulich | 1981-09-15 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4289357 | Hollow cutting head | Alfred Zitz, Otto Schetina, Herwig Wrulich | 1981-09-15 |