File:Vintage Fedtro Precision Mechanical Pocket Calculator, Made In Japan, Sold For 69 Cents, Circa 1966 (16385763876).jpg - Wikimedia Commons
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File:Vintage Bowmar Electronic Pocket Calculator, Model MX-50 (aka
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Jerry Merryman, Co-Inventor of the Pocket Calculator, Dies at 86 - The New York Times
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