This listing is for a K&E Manual, Log Log Duplex Decitrig Slide rule N4081, published by Keuffel & Esser Co in 1947. This is a paperback slide rule instruction manual by Lyman Kells, Willis Kern, James Bland all Professors of Mathematics and all at the United States Naval Academy
Condition: This manual is in good vintage used condition with signs of wear and use. Please take a look at my photos and feel free to contact me with any questions! A bit of writing on top corner of front cover and the next page at the top righthand corner - both in pencil.