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/
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