This vintage Metrics Made Easy slide rule calculator is a must-have for collectors and enthusiasts of engineering, science, and medicine from the 1930s to the present. Made in the United States with copyright from 1973, this pocket-sized duo fast slide rule is a remarkable piece of history. The calculator is in excellent working condition and comes with an advertisement modification description of Dale's Shoe Store, Quality Footwear, Expert Shoe Repair, 111 S Main St, Gibsonburg Ohio.