| Name | Keuffel & Esser N < 4053 - 5 > Polyphase Mannheim Adjustable Dated 1923 |
| Front Scales | 20inch / A = B CI C = D K ] 50cm |
| Back Scales | = S L T = |
| Type of Rule | slide rule |
| Material | engine divided celluloid laminated mahogany |
| Dimension (mm) | |
| Area of Use | generic |
| Origin of Rule | Michael O'Leary |
| Match Number | 4686 |
| Comment | |
| Thumbnail |  |