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Casio - QL-10 - - LCD calculator - Casio QL10 - Casio.ledudu.com - Casio pocket computer, calculator, game and watch library. - RETRO CALCULATOR FX PB SF LC SL HP FA
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How to change the Brightness and Contrast Settings on Casio Classwiz fx-991EX Calculator - YouTube
File:Vintage Casio Combination Pocket Calculator And Cigarette Lighter, Model QL-10, Uses Butane Gas And Piezo Ignition, Made In Japan, Circa 1978 (29914290953).jpg - Wikimedia Commons