| Name | Keuffel & Esser 1744 B Duplex with interchangeable slides both arithmetical and trigonometrical, dated 1897, 1899 |
| Front Scales | A = B C = D second slide: = B C = |
| Back Scales | A = BI CI = D second slide: = S L T = |
| Type of Rule | slide rule |
| Material | engine divided celluloid laminated mahogany |
| Dimension (mm) | |
| Area of Use | generic |
| Origin of Rule | Dave Hanssen |
| Match Number | 4587 |
| Comment | |
| Thumbnail |  |