| Name and Model Number | Japanese Artillery Slide Rule For T-99 Gun |
| Country of Origin | Japan |
| Date of Manufacture | 1940 to 1945 |
| Front Scales | Distance, Height, Deflection, seconds |
| Back Scales | Instructions (see translation) |
| Scale Length | |
| Type of Rule | Slide Rule |
| Construction | Aluminum |
| Area of Use | Military |
| Comment | This unusual slide rule was manufactured during WWII. It was used for a T-99 anti-aircraft gun manufactured under license from Krupps in Germany. See translation for details. |
| Rarity | RRRR |
| Donor | Collection of John Hunt snr (in UK) |
| Match Number | 389 |
| 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. |