| Name and Model Number | K&E Chemco |
| Country of Origin | USA |
| Date of Manufacture | |
| Front Scales | A=B C P = L |
| Back Scales | |
| Scale Length | 20 ins |
| Type of Rule | Slide Rule |
| Construction | Mahogany with white celluloid face |
| Area of Use | Photography |
| Comment | This slide rule has K&E logo stamped on the front. It is also marked ""Chemco Photoproducts Company Ltd, Glen Cove NY"", and ""Copyright 1950"". I haven't been able to find a mention of it anywhere on the internet, not sure what it is used for.
The A and B scales start at 1 and end at 50 The P scale is folded (starts at 6), and ends at 300. The L scale is folded (starts at 14) and ends at 700 The C scale is folded (starts at 10) and ends at 100 folded at 10 relative to A and B |
| Rarity | RRRR |
| Donor | Collection of Wayne Harrison |
| Match Number | 404 |
| 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. |