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FIRST PORTABLE CALCULATOR, 1673 - designed by Rene Grillet de Roven, the watchmaker to French king Louis XIV. The machine is capable of performing a multitude of arithmetic calculations. : r/Damnthatsinteresting
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René Grillet de Roven – Computer Timeline
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Top 10 Most Expensive Calculators of All Time - dairacademy
9 Most Expensive Calculators You Can Buy - Rarest.org
The 10 Most Expensive Calculators in The World - So Expensive
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Grillet portable calculator to auction for $155,000?
World's most expensive calculator. Grillet portable Calculator. Knowledge Mood. - YouTube
Pascal's calculator - Wikipedia
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The World's Most Expensive 15 Calculators List: With Details
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Texas Instruments – dba.dk – Køb og Salg af Nyt og Brugt
