Vintage K & E Keuffel & Esser N 4081-5 22" Slide Rule With Case This a 22" N4081-5 Log Log Duplex Decitrig, Patent 2,086,502 made in 1947
Front of slide rule features these scales: LL01, K, A, - CF, CIF, CI, C - D, L, LL1
Back of slide rule features these scales: LL02, LL03, DF - B, T, ST, S - D, LL3, LL2 The white is turned a little to an off white or light cream and there are 2 screws missing in the cursor There are a few signs of use on the case, but some saddle soap would refresh it. Over all it is in very nice condition
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