Vintage Slide Rule Keuffel & Esser 4053-3 Polyphase w/ Leather Case 1920's-30's For Sale

The Vintage Keuffel & Esser 4053-3 Polyphase Slide Rule from the 1920's-30's is a rare and sought-after collectible for those interested in engineering and scientific history. Made in the United States, this slide rule is a testament to the craftsmanship and precision of that era. It comes with its original leather case, adding to its charm and authenticity. Perfect for collectors or enthusiasts looking to own a piece of history from the early 20th century. Stiched flap enclosure indicates early manufacture. Very Rare