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File:Vintage Casio Computer Quartz CQ-1 Electronic Pocket Calculator, Made in Japan, Circa 1975 (11574678186).jpg - Wikimedia Commons
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Amazon.com : Casio Fx-570Es Plus 2 Scientific Calculator with 417 Functions, Black : Office Products
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Casio Computer Co., Ltd FX115ESPLUS FX-115ESPLUS Advanced Scientific Calculator, 10-Digit Natural Textbook Display by CASIO, INC.
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