Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4262528 | Apparatus for measuring the torque applied to a wrench | Armin Rahn | 1981-04-21 |
| 4218828 | Device for measuring the tightening angle on a wrench | Armin Rahn, Hermann J. Zerver | 1980-08-26 |