K&E Log Log Duplex Decitrig Slide Rule - 1947 (No. 4081-3)

Keuffel & Esser Co. - New York
Scales: A-B-C-C1-C1F-CF-D-D1-DF -L-LL1-LL2-LL3-LL01-LL02-LL03-K-S-SRT-T
Overall length: 12.5 inches (Ruled portion = 10 inches)