Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4524651 | Power wrench | Karl-Richard Hirtsiefer, Paul Wagner | 1985-06-25 |
| 4513827 | Rotary tool | — | 1985-04-30 |
| 4418590 | Screw assembly with torque determination | Karl-Richard Hirtsiefer, Johann Muller, by Christine Muller, executrix | 1983-12-06 |
| 4368811 | Friction clutch | Dieter Pretzel | 1983-01-18 |
| 4256210 | Friction clutch | Dieter Pretzel | 1981-03-17 |
| 4238019 | Friction clutch | Paul Maucher | 1980-12-09 |