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

Vtg Pickett Eckel N600-ES Log Speed Slide Rule Synchro Scale/Case Chicago 1962

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

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

Vintage 1959 Pickett N4-ES Vector-Type Log Log Dual-Base Speed Slide Rule + Case

Pickett Model N4-ES Vector Type Dual Base Speed Rule with Leather Case

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

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