This vintage slide rule calculator from 1961 is a must-have for collectors and engineering enthusiasts alike. Crafted in the United States, this piece is a testament to the precision and craftsmanship of the era. The calculator features calculations for steam-liquid, air-gas, and orifice flow, making it a versatile tool for any engineer.

Not only is this slide rule calculator functional, but it also has a beautiful design that is sure to catch the eye of any collector. Despite being a used item, it is in excellent condition and has been well-preserved over the years. Add this unique piece to your collection today!