This vintage slide rule from KEUFFEL & ESSER K+E DECI-LON is a must-have for collectors and enthusiasts of engineering and science memorabilia. With its sleek design and precision, this slide rule is perfect for calculations and measurements. This vintage rule is in great shape and comes with its original case, making it a great addition to any collection. The KEUFFEL & ESSER K+E DECI-LON slide rule is a unique piece of history that will make a great conversation starter. Its features include a slide rule design that is perfect for engineering and science applications. This item is a great find for anyone interested in vintage technology and has a passion for collecting.