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Curta.Org, Your Complete Curta Calculator Site
Curta Calculator History: A Mechanical Calculator Survival Story
Retrotechtacular: The CURTA Mechanical Calculator | Hackaday
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The Curta mechanical Calculator and Curt Herstark's History
Amazon.com : Mechanical Calculator 12 Digit Extra Large 5-Inch LCD Display, DECKLIT Battery Desk Calculator, Big Buttons Easy to Press Use as Office Calculators Desktop, 15°Tilt Screen for Kids Calculator(Green) : Office
♕♕♕ RARE - CURTA Calculator TYPE II #542948 - Very Good Condition - 1967 ♕♕♕ | eBay
Amazon.com : Mechanical Calculator 12 Digit Extra Large 5-Inch LCD Display, DECKLIT Battery Desk Calculator, Big Buttons Easy to Press Use as Office Calculators Desktop, 15°Tilt Screen for Kids Calculator(Black) : Office
♕♕♕ RARE - Early CURTA Calculator TYPE I #8924- Very Good Condition - 1949 ♕♕♕ | eBay
TIL about the 'Curta mechanical calculator' - "Many purchasers were the "nerds" of that era, and many were armed with a screwdriver and an insatiable curiosity." : r/todayilearned