Slide calculator - Wikipedia
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Mic-UK: A gallery of a selection of calculating aid designs spanning over 2000 years.
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File:Circular slide rule.JPG - Wikipedia
The invention that altered history: The slide rule - The Jerusalem Post
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File:Circular slide rule.jpg - Wikipedia
Calculator - Wikipedia
File:Vintage Texas Instruments Model SR-10 Pocket LED Calculator, First of a Line of TI Slide Rule Models, Sealed Battery, Price - 149.95 USD, Circa 1972 (14592862578).jpg - Wikimedia Commons
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Slide calculator - Wikipedia
File:Vintage Rockwell Scientific Slide Rule Electronic Pocket Calculator, Model 63R, Rechargeable Battery & AC Adapter, Assembled In Mexico, Circa 1975 (39863857230).jpg - Wikimedia Commons
