SHOW AND TELL 145: Slide Rule, Sun Hemmi No. 257 Chemical Engineer, Date Code FG = 1955 July

SHOW AND TELL [145]: Slide Rule, Sun Hemmi No. 257 Chemical Engineer, Date Code FG = 1955 July.

Wikipedia article on Slide Rule : https://en.wikipedia.org/wiki/Slide_rule

SLIDE RULE MUSEUM Link to more info : https://www.sliderulemuseum.com/Hemmi.htm

HEMMI Slide Rule Co., Ltd History Link : https://hemmi-inc.co.jp/history/