| Name | Pickett N 531 ES |
| Front Scales | L Ln A = B CI C = D 2 K |
| Back Scales | LL2 LL1 = S ST T C = D LL3 |
| Type of Rule | slide rule |
| Material | metal |
| Dimension (mm) | 308x38x2.5 |
| Area of Use | generic |
| Origin of Rule | Michael O'Leary |
| Match Number | 2171 |
| Comment | |
| Thumbnail |  |