Source
Wikipedia: Comptometer
Web Source
Facts
Urlhttps://en.wikipedia.org/wiki/Comptometer
Sources
Wikipedia: Comptometer
Lead sectionQuote, Lead section
The comptometer was the first commercially successful key-driven mechanical calculator, patented in the United States by Dorr Felt in 1887.
Claims Backed By This Source (6 claims)
This source backs 6 claims across the atlas. As facts: 3 well-attested. As cited relationships: 1 holds. Plus 2 entities citing it as a general reference with no single fact or relationship attached.
Disposition By Topic
- Systems, 5 claims: 2 well-attested, 1 holds, 2 general references.
- Sources, 1 claims: 1 well-attested.
Reader Challenges (0)
No disputes yet. Spotted an error or a better source? Open the first one.
Sign in to dispute this or suggest a correction.