Keuffel and Essex Co Slide Rule 68 1617 with manual 68 2063

Keuffel and Essex Co Slide Rule 68 1617 with manual 68 2063. 11” end to end not extended. Slide Rule good condition. The book has no markings in it that I see. I have another of these for sale and the slide rule may be better in the other listing but the book in this listing is much better. See pictures. You get ruler, cover, and book. Tags: vintage, math, science, retro, educational, school, slide rule