| Name | Keuffel & Esser < 4097 C > Ever - There, (Old 4098) Variant |
| Front Scales | A = B CI C = D K |
| Back Scales | 5inch = S L T = 13cm |
| Type of Rule | slide rule |
| Material | Engine Divided White Xylonite |
| Dimension (mm) | 153x33x3.5 |
| Area of Use | generic |
| Origin of Rule | Michael O'Leary |
| Match Number | 5049 |
| Comment | |
| Thumbnail |  |