Original Roman Pocket Calculators are Extremely Rare | blog@CACM | Communications of the ACM
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9 Most Expensive Calculators You Can Buy - Rarest.org
File:Vintage Texas Instruments The M.B.A. Pocket LED Calculator, Made in the USA, Moderately Rare, Original Price 79.95 USD, Circa 1977 (9302615968).jpg - Wikimedia Commons