| Name | Graphoplex 640 Electric Log Log |
| Front Scales | 27cm / L B3 B2 = b2 a b = B LL3 LL2 LL1 |
| Back Scales | = cos sin tg b = |
| Type of Rule | slide rule |
| Material | plastic |
| Dimension (mm) | 291x46x6 |
| Area of Use | generic |
| Origin of Rule | Herman van Herwijnen |
| Match Number | 1311 |
| Comment | |
| Thumbnail |  |