I didn't see any Keuffel and Esser slide rules listed. They were one of the leading brands back in the day. Here's a link for those who are interested in expl

I didn't see any Keuffel and Esser slide rules listed. They were one of the leading brands back in the day. Here's a link for those who are interested in exploring more slide rules: http://www.sphere.bc.ca/test/ke-sliderule.html http://www.sphere.bc.ca/test/ke-sliderule.html