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Interesting fact: The power on button on Casio's higher end calculators are half pressed by default so you don't accidentally clear the screen by pressing the 'on' button. (I thought it's a
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Amazon.com: Practical Calculator Buttons Handheld Daily and Basic Office Standard Function Scientific Calculator (Black) : Office Products
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Casio Calculator Tutorial - Overview of Essential Buttons (fx-83GT PLUS, fx-85GT PLUS, fx-300ES) - YouTube
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Calculator. Calculator Buttons. the Numbers on the Buttons of the Calculator. the Device for Counting. Maths Stock Photo - Image of counting, cell: 144833328
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