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The Slide Rule: A Computing Device That Put A Man On The Moon : NPR Ed : NPR
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Mic-UK: A gallery of a selection of calculating aid designs spanning over 2000 years.
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Vintage 1960s MAGIC BRAIN Pocket Mechanical Addiator Calculator
USED Magic Brain Calculator w/stylus Magic-Brain Made in Japan w
Found this old calculator in my great grandmother's attic : r