File:Vintage Calfax Data Brain II Electronic Pocket Calculator, Similar To The Unifive Data Brain II (aka Unifive 301) Made In The USA, Red LED Display, Made In Hong Kong, Circa 1974 (14212785093).jpg

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Data Brain II by Calfax Vintage Calculator Works With Rare Power Supply #I

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File:Vintage Texas Instruments TI-54 LCD Electronic Pocket Calculator, Made In USA, Copyright Date On Original Box Is 1981 (24028190510).jpg - Wikipedia

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