Vintage Slide Rule With Leather Case Keuffel & Esser Co. N.Y. 1930-1940’s USA

Vintage Keuffel & Esser Slide Rule And Original Leather Case With Closure , Has Original Owners Name On Inside Closure And Along The Outside Of Case Faintly Except The First Letter.In Very Good Condition No Working Issues. The slide ruler is clean and white color still and the plastic on the slide is very clean and readable, Engineering. Keuffel & Esser Co. N.Y. Slide Rule And Leather Case 4081-3S USA 1930’s-1940’s