1959 Pickett Model N4-ES Slide Rule Vector-Type Log Dual-Base Speed Ruler Yellow

Pickett Model N4-T Slide Rule 1959 Vector-Type Log Dual-Base Speed Rule W/ Case

Vintage Lafayette Slide Rule Model F681 Deci Log

Vintage Pickett Eckel Slide Rule N4-ES Leather Case USA 1959 Vector Type Log Log

Pickett slide rule N 3-ES all metal leather case made in USA vintage

1959 Pickett Model N4-ES Slide Rule Vector-Type Log Dual-Base Speed Ruler

1959 Pickett Model N4-ES Slide Rule Vector-Type Log Dual-Base Speed Rule W/ Case

Pickett Model N-1010-ES Trig Slide Rule With Leather Case USA Vintage