K & E Log Log Duplex Decitrig Slide Rule N4081-5 (1947)

Kueffel & Esser Co. - New York
Scales: A-B-C-C1-CF-CF1-D-DF-K-L-LL1-LL2
LL3-LL01-LL02-LL03-S-ST-T
Overall length: 22.25 inches (Ruled portion = 19.75 inches)