Pay in 4 interest-free payments of $19.50 Learn more
Ships within 48 hours · Estimated delivery Aug 1 - Aug 6
There are some Shiny Brights
The cards are in good shape overall with soil
- FOUR small mid century modern trays (as shown)
The cup has a few minor chips
The fabric is discolored showing spots and stains
Keuffel & Esser Polyphase Slide Rule with Case and Instruction Manual Valentine There are some Shiny BrightsBefore 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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