| Name | Keuffel & Esser Unknown number Made by Tavernier Gravet, dated 1883 |
| Front Scales | 20cm / A = B C = D ] 21cm (#21-42cm#) |
| Back Scales | = S L T = |
| Type of Rule | slide rule |
| Material | polished boxwood |
| Dimension (mm) | |
| Area of Use | generic |
| Origin of Rule | Bob Otnes |
| Match Number | 4728 |
| Comment | |
| Thumbnail |  |