Vintage Keuffel & Esser 4081-3 Slide Rule w/ Leather Case

Keuffel & Esser 4081-3 Slide Rule w/ Leather Case Made in the USA The 4081-3 family of slide rules became the main stay for the K&E line of slide rules in the 1940s, 50s, and 60s, The construction of the 4081-3 family evolved during the life of the family group. There is writing with someone's name on the case