| Name | Blundell T 51 Janus |
| Front Scales | K LL0 A = B CI C = D LL00 S ST T |
| Back Scales | L LL1 DF = CF CIF CI C = D LL3 LL2 |
| Type of Rule | slide rule |
| Material | PVC |
| Dimension (mm) | |
| Area of Use | generic |
| Origin of Rule | brochure |
| Match Number | 2946 |
| Comment | |
| Thumbnail | No Picture |