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Curta - Wikipedia
Mechanical calculators: computing without electricity - LOW-TECH MAGAZINE
Curta - Wikipedia
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A Curta Calculator c 1968
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Numbers in a can: the 'Curta' handheld calculator – Swiss National Museum - Swiss history blog
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1950 Curta Calculator - YouTube
The hand-cranked calculator invented by a Nazi concentration camp prisoner | Ars Technica
The CURTA Calculator Page
Amazon.com: 1952 - Curta Pocket Mechanical Calculator - C. Herzstark - Patent Art Poster: Posters & Prints
