ESCO is well ensconced as a global manufacturer of metal parts, castings, and components for industrial machinery. It operates through two segments: engineered products and turbine technologies. Mining customers account for the majority of sales for ESCO's engineered products, which include crusher wear-parts and bi-metallic buttons, as well as screens, blocks, tooth systems, and other heavy parts that hit the dirt and wear out. Turbine technologies makes cast parts such as blades and vanes used in the aerospace and power generation industries. ESCO was founded in 1913 as Electric Steel Foundry, which primarily made trolley car replacement parts. The company filed to go public in 2011.