My father used to have a few slide rules from his youth. His favorite and mine was his Keuffel & Esser 4081. It was in beautiful condition and I loved learning about mathematical relationships from it, even though I had a graphing calculator and solar-powered scientific calculators were down to $20 by the time I was a junior in high school
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http://sliderulemuseum.com/
which, like all '90s-style frametastic pages, has the charming quality that it's nontrivial to link to an internal page on it, and if you do, the site navigation breaks. It has every kind of slide rule. My favoritest page of all on it, though, is the exhibit of special-purpose cardboard and plastic slide charts ( ... )
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http://www.antiquark.com/sliderule/sim/
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