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Brilliant' man who was an inventor of the calculator dies | Daily Mail Online
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Lámina artística «Calculadora traviesa» de wetchickenlip | Redbubble
NYS Education Department on Twitter: "Happy #TriviaTuesday! Many people use a calculator almost every day. Do you know who invented the mechanical calculator? https://t.co/4X9GdYFcUS" / Twitter
Calculator inventor Jerry Merryman dies at 86 | World News,The Indian Express
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