| Name and Model Number | Military Slide Rule Keuffel & Esser 4108 |
| Country of Origin | USA |
| Date of Manufacture | 1946 from serial number |
| Front Scales | Opposite angle [ Apex angle CI C ] D A |
| Back Scales | [Sin Sin-Tan Sin C ] |
| Scale Length | 25 cm |
| Type of Rule | Slide Rule |
| Construction | Closed frame mahogany body with celluloid laminate scale surfaces. |
| Area of Use | Military |
| Comment | This rule does not appear in K&E catalogs. This rule is one of a set of three that were contracted by the US Military. The other two were by American Blueprint Co. (K&E made the rule for American Blueprint Co. and labeled it for them) and Pickett with only slight variations. |
| Rarity | RRR |
| Donor | Collection of Clark McCoy |
| Match Number | 224 |
| Thumbnail (Click Picture for Details) |  |
| In conjunction with our 'donors' we assign a rarity rating to each item, based on the system devised by Herman van Herwijnen |
| (1929 - 2004), renowned Dutch collector, author, and creator of Herman's Archive, a collection of 5,000 slide rule images on CD. |
| • RR = Rare - 1 of 25 collectors has one; it may take a year to find an example in the marketplace. |
| • RRR = Very Rare - only a few known to collectors; may be several years before it comes up for sale. |
| • RRRR = Extremely Rare - a museum piece; unlikely that an example will come up for sale. |