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The Curta Calculator: A Mechanical Marvel Explained | Part 1
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Adam Savage's Curta Calculator Gets CT Scanned!
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These Keys Shouldn't Exist | Nostalgia Nerd
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The Mechanical Integrator - a machine that does calculus
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This Amazing 70 Year Old Calculating Machine
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The Clever Way to Count Tanks - Numberphile
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How I built a Mechanical Calculator
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