| Name | Keuffel & Esser 68 - 1960 Jet-Log Projection Slide Rule |
| Front Scales | LL01 L K A = B T SRT S = D DI LL1 |
| Back Scales | LL02 LL03 DF = CF CIF CI C = D LL3 LL2 |
| Type of Rule | |
| Material | "clear ""eye-ease"" green unbreakable plastic, with red and black numbers" |
| Dimension (mm) | |
| Area of Use | |
| Origin of Rule | Michael O'Leary |
| Match Number | 4227 |
| Comment | |
| Thumbnail | No Picture |