The Pickett Microline 140 White 12" Slide Rule is a vintage drafting tool that was manufactured in the United States in the mid-20th century. It is a collectible item for science and medicine enthusiasts, particularly in the field of engineering. This slide rule features a classic design and is a practical tool for precise calculations in various disciplines. With its durability and accuracy, it is a valuable addition to any collection or for practical use in engineering and drafting projects.