This vintage Radio Shack Metric Converter Slide Rule Chart was made in the United States. It is a great addition to any collector's collection. This slide rule chart was designed for use in the field of engineering and has been well preserved for its age. The unique design of this slide rule chart allows for easy conversion of metric units to imperial units, making it a useful tool for scientific and mathematical calculations. Whether you are a collector or looking for a practical tool, this vintage slide rule chart is a great choice.