| Name | Aristo 99 Rietz (Ahrend 691) Variant |
| Front Scales | 28cm / K A = B CI C = D L |
| Back Scales | = S ST T = 11inch |
| Type of Rule | slide rule |
| Material | plastic |
| Dimension (mm) | 299x41x5.5 |
| Area of Use | generic |
| Origin of Rule | actual item |
| Match Number | 145 |
| Comment | |
| Thumbnail | No Picture |