{"product_id":"vintage-keuffel-esser-k-e-pocket-slide-rule-no-4053-3-w-leather-case","title":"Vintage Keuffel \u0026 Esser K\u0026E Pocket Slide Rule No. 4053-3 w Leather Case","description":"\u003cp\u003eVintage Keuffel \u0026amp; Esser K\u0026amp;E Pocket Slide Rule No. 4053-3 w Leather Case\u003cbr\u003e\u003cbr\u003eVintage Keuffel \u0026amp; Esser Co. pocket slide rule model 4053-3 with original brown leather carrying case. Features multiple engineering and mathematical scales, including logarithmic and trigonometric functions. Marked Keuffel \u0026amp; Esser Co. N.Y., Made in U.S.A., and Pat. June 5, 1900. A classic scientific calculating instrument used by engineers, architects, surveyors, and students before electronic calculators became common.\u003cbr\u003e\u003cbr\u003eCondition\u003cbr\u003eGood pre-owned condition with light wear, age discoloration, and handling marks. Slide moves smoothly. Leather case shows wear consistent with age and storage, including a missing portion of the closure strap. Untested for accuracy. Please review photos for details.\u003cbr\u003e\u003cbr\u003eSize\u003cbr\u003eApproximately 10\" long\u003cbr\u003e\u003cbr\u003eMaterials\u003cbr\u003ePlastic, Wood Veneer, Leather\u003cbr\u003e\u003cbr\u003eColors\u003cbr\u003eCream, Brown, Black\u003cbr\u003e\u003cbr\u003eEstimated Age\u003cbr\u003eMid 20th Century\u003cbr\u003e\u003cbr\u003eDisclaimer: AI-generated images may appear at the end of the photo lineup for styling purposes only and may not exactly represent the item. Photos of the actual item are included. Vintage pieces may show age—please review all photos and details carefully.\u003c\/p\u003e","brand":"Keuffel \u0026 Esser Co.","offers":[{"title":"cream \/ plastic","offer_id":46646398681287,"sku":null,"price":45.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0696\/3553\/9143\/files\/MQZMaGRv_0.jpg?v=1781213258","url":"https:\/\/aurorastreasurechest.com\/products\/vintage-keuffel-esser-k-e-pocket-slide-rule-no-4053-3-w-leather-case","provider":"Aurora's Treasure Chest","version":"1.0","type":"link"}