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Mental Math: Tricks To Become A Human Calculator a book by Ofpad
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Found this old calculator in my great grandmother's attic : r
Math Illustrations Unique Modern and Vintage Style Stock
BE A HUMAN CALCULATOR by Rajesh Sarswat
National Museum of American History
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Unopened package Includes instructions, Calculator and Stylus are both metal
Vintage 1960's Magic Brain Pocket Calculator W/Stylus, Made in Hong Kong
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