This vintage slide ruler from Keuffel & Esser Co. is a must-have for collectors and enthusiasts of engineering and medical equipment. Made in the United States in 1947, this N4080-3 model features a duplex vector design and comes in a stylish orange case.

With its precise measurements and durable construction, this slide ruler is perfect for both display and practical use. Whether you're a collector or a practicing engineer, this piece is sure to be a valuable addition to your collection.

Slide cracked but doesn’t affect the performance. See photos