| Country of Origin | United States |
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Check the listing for details. Keuffel & Esser K&E 4081-3 Log Log Duplex Slide Rule w/ Case Vintage. Condition: Used, Made in United States. Listed at 69.99 USD. Vintage Keuffel & Esser (K+E) slide rule, model 4081-3 Log Log Duplex, a classic precision calculating tool used by engineers, students, and professionals before electronic calculators became standard. This listing includes the slide rule and the protective case (marked C.J. Baxter). Item Details Brand: Keuffel & Esser (K+E) Model: 4081-3 Type: Log Log Duplex Slide Rule Made in: USA Includes: Slide rule + case (as shown) Good vintage condition with normal signs of age/use. Markings, scales, and lettering are visible. Please review all photos closely for cosmetic condition and what is included.
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