| Name | Graphoplex (615) Caltex |
| Front Scales | 17cm / B3 B2 = b2 a b = B L #øF øC# |
| Back Scales | = 1) 2) = |
| Type of Rule | slide rule |
| Material | plastic |
| Dimension (mm) | 185x32x5 |
| Area of Use | generic |
| Origin of Rule | Herman van Herwijnen |
| Match Number | 1289 |
| Comment | |
| Thumbnail |  |