Full Details

Name and Model Number Badalamenti's Factorization rule
Country of Origin Italy
Date of Manufacture Approx. 1960
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
(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.