Caelum

Caelum makes industrial heat-exchange equipment, such as vaporizers, condensers, and piping, used in geothermal power plants, as well as pressure vessels and related hardware for chemical and liquefied-natural-gas processing facilities.

It also operates two subsidiaries: one that supplies character-branded smartwatches and phones designed for children and seniors to mobile carriers, and one that manufactures aircraft components. Listed on KOSDAQ, Korea's tech and small-cap board, the parent company's core business has traditionally centered on geothermal power equipment, though its chemical and LNG plant segment has grown to represent a larger share of activity.