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

VTG Pickett Model N4-ES Vector-Type Log Log Dual-Base Speed slide rule with case

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

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

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

Pickett Slide Rule Dual Base Speed Metal Mod N4-ES LOG LOG Leather Case Vtg 1959

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

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