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1970's pocket calculator. Simple arithmetic machine, handheld device. Sharp ELSI MATE EL-8031 Stock Photo - Alamy
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File:Vintage Sharp Elsi Mate Pocket Electronic Calculator, Model EL-304, LCD Display, Made In Japan, Year Introduced - 1980, Year Discontinued - 1981 (16388607237).jpg - Wikimedia Commons
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1970's pocket calculator. Simple arithmetic machine, handheld device. Sharp ELSI MATE EL-8031 Stock Photo - Alamy
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