| Name and Model Number | Rotring Reduktions-Rechenstab RS 10 |
| Country of Origin | Germany |
| Date of Manufacture | Around 1970 |
| Front Scales | |
| Back Scales | |
| Scale Length | 15.5 cm |
| Type of Rule | Other |
| Construction | Scales painted on aluminium. |
| Area of Use | Technical |
| Comment | This reduction slide rule (Reduktions-Rechenstab) was meant to be affixed on
portable drawing boards made by Rotring (the company who bought over Aristo around 1978). |
| Rarity | RR |
| Donor | Photo from a collection in Belgium |
| Match Number | 342 |
| 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. |