This vintage slide rule from Keuffel & Esser is a must-have for any collector or engineer. With its elegant design and durable case, this slide rule will make a perfect addition to your collection. It's perfect for use in both science and engineering fields and is sure to be a conversation starter. Whether you're a collector or just looking for a unique tool, this Keuffel & Esser slide rule will not disappoint. Its precision and accuracy are unmatched, making it a valuable tool for any professional. Don't miss out on this opportunity to own a piece of history.