This vintage slide ruler is a rare collectible piece for those interested in engineering and science. Made in the United States, this 13-inch slide ruler comes in a leather case, adding to its charm and authenticity. This unique tool reflects the era of precision drafting and problem-solving, making it a valuable addition to any collection. Labeled Lehigh University Founded by Asa Packer 1865 … Homo Minister Et Interpres glass is cracked on one side of the ruler.