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Casio TC-500 Touch Calculator Watch (1983) | eBay
Casio SL-80 Handheld Electronic Calculator | National Museum of American History
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Amazon.com: Customer reviews: Casio Touchscreen with Stylus Graphing Calculator, 4.8 (fx-CG500)
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Casio Calculator Watch, Vintage C-80, With Original Box, Finger Touch | Inox Wind
Before Smartwatches, There was the Gesture-Controlled, Touchscreen Casio AT-552 Janus Calculator Watch from 1984 - TechEBlog
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File:Casio-TC500-Calculator-Watch.jpg - Wikimedia Commons
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