| Name | Graphoplex Oilcompany rule |
| Front Scales | 5inch / Gross loss % øF øC C = D Net loss |
| Back Scales | %= Excess air % CO2 % Oxy. % = |
| Type of Rule | slide rule |
| Material | plastic |
| Dimension (mm) | 152x31.5x5 |
| Area of Use | oil industry |
| Origin of Rule | IJzebrand Schuitema |
| Match Number | 3287 |
| Comment | |
| Thumbnail |  |