Concise ruler 28N 100973 English Ver. Circular slide rule

Concise ruler circular slide rule 28N 100973 English Ver.

Concise Ruler Circular Slide Rule 28N 100973 Dedicated Storage Case Included

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

Concise 100973 Ruler Circular Slide Rule 28N Diameter 84mm From Japan

Concise Ruler Circular Slide Rule 28N 100973 JAPAN81

Concise Circular Slide Rule NO. 28N 100973 (English Version) Ruler w/ Tracking #

Concise ruler 28N English Version Circular slide rule made in Japan