Pickett Slide Rule Model No. N4-T (Copyright 1959)

Pickett & Eckel, Inc. - Chicago, Illinois
Scales: C-C1-C1F-CF-CF/M-D-D1-DF-DF/M- L-Ln-LL1-LL2-LL3-LL4-S-SH-ST-T-TH and others
Overall length: 12 inches (Ruled portion = 10 inches)