| Name and Model Number | FUJI NO. 42 |
| Country of Origin | Japan |
| Date of Manufacture | |
| Front Scales | DF [CF CI C] D |
| Back Scales | S L T |
| Scale Length | 10 cm |
| Type of Rule | Slide Rule |
| Construction | Plastic |
| Area of Use | Generic |
| Comment | FUJI produced at least six pocket slide rules with this quite unusual
scale length of 100mm. They were numbered: No. 41, No. 42, No. 401, No. 401 R, No. 402 and No. 402R. The CF-DF scales are folded at square root of 10. |
| Rarity | RR |
| Donor | Photo from a collection in Belgium |
| Match Number | 340 |
| 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. |