| Name | Keuffel & Esser 4088 - 1S Polyphase Duplex |
| Front Scales | K A = B S T CI = D L |
| Back Scales | DF = CF CIF C = D |
| 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 | 4296 |
| Comment | |
| Thumbnail | No Picture |