| Name | Nestler 21 Darmstadt |
| Front Scales | 27cm L / K A = B CI C = D P / sin tg |
| Back Scales | = LL1 LL2 LL3 = |
| Type of Rule | Slide Rule |
| Material | Wood/Plastic |
| Dimension (mm) | 295x38x11 |
| Area of Use | Generic |
| Origin of Rule | Alessandro Manni's Collection |
| Match Number | 7072 |
| Comment | Coming from Prague. |
| Thumbnail |  |