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Ships within 48 hours · Estimated delivery Jul 28 - Aug 2
These beauties are in very good condition with overall wear consistent with age and use
The black zippered fabric backing is in good condition
The fabric is discolored showing spots and stains
The cup has a few minor chips
Keuffel & Esser Polyphase Slide Rule with Case and Instruction Manual Valentine These beauties are in veryBefore computers, slide rules were IMPORTANT tools. Today, they are relics of the past. However, this Keuffel & Esser polyphase slide rule is not a relic. Instead, it's a peek into the greatest math minds from yesterday. A look at the history of mathematics and how slide rules were used by engineers and scientists before computers were in every household. A great gift for the math nerd (or math genius) in your life. Listing Includes ONE vintage
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