This vintage Pickett Slide Rule Model 520-T USAF Aerial Photo Type A-1 is a rare find for collectors and enthusiasts alike. Made in the United States, this slide rule is a piece of history that is perfect for display or use. The leather case included in the package ensures that this valuable item is well-protected and ready for its next owner. With its precise measurements and high-quality construction, this slide rule is a must-have for anyone interested in engineering, science, and medicine. Whether you're a collector or an active professional, this item is sure to impress. Don't miss your chance to own a piece of American history.