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CASIO Calculators Global - Thomas Alba Edison (1847-1931) was the inventor and entrepreneur of the United States.He is also famous for the phrase "genius is 1% inspiration and 99% effort" and the
A Brief History of Calculators in the Classroom
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Who invented the mechanical calculator and when did they do it? Why are they not famous for this invention? - Quora
Brilliant' inventor who co-created first handheld calculator in 1967 dies | Metro News
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The History Of The Calculator: When was the Calculator First Invented?
The History Of The Calculator: When was the Calculator First Invented?
Technology: How the calculator was invented - Newspaper - DAWN.COM
World's first handheld calculator up for grabs - BBC Newsround
Calculator - Wikipedia
The History Of The Calculator: When was the Calculator First Invented?
First handheld calculator headlines auction of mathematical treasures
Jerry Merryman, A 'Brilliant' Man Who Was An Inventor Of The Calculator, Dies At 86 | KERA News
Mechanical calculator - Wikipedia
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The first hand held calculator was invented in 1967... | Sutori