| Name | Blundell T 50 Janus Variant |
| 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 | 2944 |
| Comment | |
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