{"product_id":"antique-slide-rule-keuffel-and-esser-n4043-3","title":"Antique Slide Rule Keuffel and Esser N4043-3","description":"\u003cp\u003eThis is a vintage Keuffel and Esser Slide Ruler, model N4043-3. Circa 1940s-1950s, the 10\" slide rule was constructed on a mahogany wood frame with a celluloid overlay laminated surface.\u003c\/p\u003e\n\n\u003cp\u003eThe rule is in good condition with graphic darkening on reverse. The metal rimmed cursor has no chips or scratches. The black leather case is included,\u003c\/p\u003e\n\n\u003cp\u003eRule Details:\u003cbr\u003e\nMade in U.S.A. by Keuffel \u0026amp; Esser Co., New York\u003cbr\u003e\nPatents listed on stock: 1,934,232; on cursor:2,086,502\u003cbr\u003e\nK\u0026amp;E N4053-3 Polyphase, Serial Number 725837\u003cbr\u003e\n10in \/\/ A [ B, CI, C ] D, K || 25cm\u003cbr\u003e\n[ S, L, T ]\u003cbr\u003e\nEquivalents\t\u003cbr\u003e\nNew K\u0026amp;E logo on right of slide.\u003c\/p\u003e","brand":"Duckwells","offers":[{"title":"Default Title","offer_id":50480838672576,"sku":"esp1791873904097","price":49.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/9509\/2160\/files\/antique-slide-rule-keuffel-and-esser-n4043-3_1.jpg?v=1791873908","url":"https:\/\/freshmodaura.shop\/products\/antique-slide-rule-keuffel-and-esser-n4043-3","provider":"My Store","version":"1.0","type":"link"}