About this slide rule

This slide rule belonged to my grandpa, Milton Berg. He was a lifelong engineer who worked at Boeing, the Grand Coulee Dam and the Bureau of Indian Affairs before starting his own engineering firm. My grandpa was my personal hero, and when he passed, I inherited his slide rule. It's particularly special to me since we share the same initials.

Maker: Keuffel & Esser Co., N.Y.
Model: 4081-3 Log Log Duplex Decitrig
Serial: 157122
Made: 1939 to 1947
Owner: Milt Berg

Production dates from the Smithsonian: K&E 4081-3 at the National Museum of American History.

My Grandpa's Slide Rule

Photograph of the slide rule on a wooden desk, showing the L, LL1, DF, D, LL3 and LL2 scales and the initials MLB written on the left end bracket

Photograph of the other face of the slide rule, showing the LL0, LL00, A, D, DI and K scales and the model number 4081-3

Photograph of the black leather case with a K and E stamp on the flap