| Name and Model Number | K&E Decimal Keeping Slide Rule Type I |
| Country of Origin | USA |
| Date of Manufacture | c. 1915 |
| Front Scales | A [B C ] D |
| Back Scales | S L T, Beveled edge has inch scale, Lower edge has cm-scale, Back of Slide Rule has tables of conversion factors and constants |
| Scale Length | 25-cm |
| Type of Rule | Slide Rule |
| Construction | Closed frame mahogany body with celluloid laminate scale surfaces. Frameless cursor. |
| Area of Use | Generic |
| Comment | This Mannheim slide rule has a decimal keeping mnemonics on right end of slide. No model number & does not appear in K&E catalogs. |
| Rarity | RRR |
| Donor | Collection of Ed Chamberlain |
| Match Number | 160 |
| 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. |