Issued Patents All Time
Showing 76–79 of 79 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4607546 | Power wrench | — | 1986-08-26 |
| 4524651 | Power wrench | Oswald Dubiel, Karl-Richard Hirtsiefer | 1985-06-25 |
| 4440046 | Power wrench | Karl-Richard Hirtsiefer, Johann Muller, Kurt Walterscheid | 1984-04-03 |
| 4183260 | Tool for rotating nuts, bolts and like fasteners | Karl-Richard Hirtsiefer, Johann Muller | 1980-01-15 |