The vintage Keuffel Esser K&E Paragon Proportional Divider is a highly sought after collectible tool from Germany. This precision drafting tool, known as a Proportional Divider, was used in engineering and scientific applications to accurately measure and scale down precise geometric shapes. The brand Keuffel & Esser is well known for producing high-quality drafting tools, making this piece a valuable addition to any collection of vintage drafting tools.