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Re:Mechanical calculators: computing without electricity by bsdshepherd on Thursday September 11, 2014 @08:05AM (#8302069)
A Chronology of Analogue Computing http://www.rutherfordjournal.org/article020106.html

The Mechanical Analog Computers of Hannibal Ford and William Newell http://web.mit.edu/STS.035/www/PDFs/Newell.pdf

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