| Name and Model Number | Badalamenti's Factorization rule |
| Country of Origin | Italy |
| Date of Manufacture | Approx. 1960 |
| Capacity | |
| Construction | Two-sided plastic rule with a complex reversible plastic cursor |
| Area of Use | Other |
| Comment | Finds the prime factors of any number up to 3199.
Invented by Gaetano Badalamenti. For details see https://www.nzeldes.com/HOC/Factoring.htm |
| Rarity | RRR |
| Donor | Collection of Nathan Zeldes |
| Match Number | 413 |
| 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. |