vintage Keuffel & Esser co. slide rule 681318 log log duplex trig 1947 Exc. Z52 For Sale
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This is one of the best slide rulers we have had It is in exceptionally good condition. It is hard to believe it has a date on it 1947 and it is a Keuffel & Esser co. 681318 log log duplex trig. The slide ruler is clean and very white bright color still and the plastic on the slide is very clean and readable. see photos excellent condition..It is approx.12\" long by 2\" wide. please see photos vey nice.