| Name | Thornton P 241 Log Log |
| Front Scales | LL2 LL3 L A = B CI C = D S ST T |
| Back Scales | 25.5cm K DF = CF CI C = D A 10inch |
| Type of Rule | slide rule |
| Material | plastic |
| Dimension (mm) | 359x50.8x5 |
| Area of Use | generic |
| Origin of Rule | Herman van Herwijnen |
| Match Number | 2553 |
| Comment | |
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