The Vintage Keuffel & Esser 4097-C Slide Rule Pocket Size is a collectible item from the 1930s, specifically designed for engineering and mathematical calculations. This pocket-sized slide rule comes with its original case, making it a convenient and portable tool for solving complex equations on the go. The Keuffel & Esser brand is known for producing high-quality slide rules, making this particular item a sought-after piece for collectors and enthusiasts of vintage technology.

Great condition….with vinyl case