I had a Keuffel & Esser slide rule, but it has long since disappeared. Check out some of the other stuff they made: https://en.wikipedia.org/wiki/Keuffel_and_E

I had a Keuffel & Esser slide rule, but it has long since disappeared. Check out some of the other stuff they made: https://en.wikipedia.org/wiki/Keuffel_and_Esser https://en.wikipedia.org/wiki/Keuffel_and_Esser