WWII US Cased Slide Rule-This is housed in a light brown leather case which is embossed “US” on the lid. It was produced by Keuffel & Esser Co of N.Y. It includes magnifying glass. Excellent!
WWII US Cased Slide Rule-This is housed in a light brown leather case which is embossed “US” on the lid. It was produced by Keuffel & Esser Co of N.Y. It includes magnifying glass. Excellent!