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Unless you’ve touched it
resulting in an A+++ creep factor related to surface wear
The fabric is discolored showing spots and stains
The black zippered fabric backing is in good condition
There are some Shiny Brights
Keuffel & Esser Polyphase Slide Rule with Case and Instruction Manual Valentine Unless you’ve touched itBefore 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