| Name | Keuffel & Esser < 4053 - 3F > Polyphase Mannheim (other example) Adjustable Magnifier |
| Front Scales | 10inch / A = B CI C = D ] K |
| 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 | Ed Chamberlain |
| Match Number | 4755 |
| Comment | |
| Thumbnail |  |