| Name | Graphoplex 640 Electric Log Log Variant |
| Front Scales | 27cm / L P A = B K CI C = D LL3 LL2 LL1 |
| Back Scales | = ST S T<45ΓΈ C = |
| Type of Rule | slide rule |
| Material | plastic |
| Dimension (mm) | 295x45x5.5 |
| Area of Use | generic |
| Origin of Rule | Herman van Herwijnen |
| Match Number | 1312 |
| Comment | |
| Thumbnail |  |