This vintage Keuffel Esser slide rule manual from 1955 is a must-have for collectors and enthusiasts of engineering and science history. With detailed instructions and examples, this manual provides a comprehensive guide to using the Keuffel Esser slide rule, a valuable tool for students and professionals alike. The manual is in excellent shape and has been well-preserved, making it an excellent addition to any collection of vintage slide rules or engineering memorabilia. Made in the United States, this manual is a true piece of American history and a testament to the quality and precision of Keuffel Esser products.