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

Vintage 1947 PICKETT ECKEL Model 4 Slide Rule Vector Type & Case USA Engineering

1949 Pickett & Eckel Slide Rule with Leather Case Model 4 Vector Hyperbolic dl

1949 PICKETT ECKEL Model 4 Slide Rule Vector hyperbolic Type & Leather Case USA

Vintage 1947 PICKETT ECKEL Model 4 Slide Rule Vector Type & Case USA

Vtg Pickett Slide Rule N902-ES W/ Case & box

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

Vintage Pickett & Eckel Slide Rule Model No 3 Deci Log Log 1947