Check the listing for details. Keuffel & Esser K&E Polyphase Slide Rule 4053-3. Condition: Used. Listed at 19.99 USD. The Keuffel & Esser K&E Polyphase Slide Rule 4053-3 is a vintage engineering tool used for complex calculations in various fields such as engineering, mathematics, and science. This slide rule, dating back to the mid-20th century, features a unique design that allows users to solve problems involving percentages, ratios, and trigonometry. With its precision and accuracy, the K&E Polyphase Slide Rule 4053-3 is a valuable collector's item for those interested in the history and technology of engineering tools.
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