Concise 28 N Circular Slide Rule - Smith's / Smith Welding Equipment - Sliderule

Sun Hemmi 5” bamboo slide rule INERTOL promotion

Antique Keuffel & Esser Thacher Cylindrical Slide Rule Engineering Calculator

Consolidated Electrodynamics CEC Moisture Computer Circular Slide Measure

Vintage Dietzgen N174L Slide Rule – Vector Type Log – Leather Case & Box

Leitz 2980 Slide Rule

Circa 1970, Concise Conversion Tables and Circular Slide Rule. Model EE-112.

Vintage Lafayette Slide Rule Model F681 Deci Log