The Pickett Slide Rule Model N-515-T is a collectible engineering tool made in the United States. This slide rule is a precision instrument used for various calculations in engineering and scientific fields. With its compact design and durable construction, this slide rule is a valuable tool for professionals and enthusiasts alike. Perfect for solving complex mathematical problems with ease and accuracy, the Pickett Slide Rule Model N-515-T is a reliable and timeless piece of equipment. Like new...still in plastic