This vintage concrete volume computer calculator slide rule was manufactured in the United States and is a must-have item for any collector interested in science and medicine from 1930 to now. This slide rule was designed specifically for engineering purposes and is perfect for anyone interested in slide rules.

With its unique design and precise calculations, this slide rule is sure to impress any collector or engineer. This item is perfect for those looking to add to their collection or for those who want to use it for its intended purpose. Don't miss out on this amazing vintage slide rule from Porterville Ready Mix.