TDC is a company located in Japan, that is the world's only company with ultra-precision mirror polishing technology that can polish any shape of any material, including metal, ceramics, resin, and glass, with nano-level precision. TDC has a total of 4,000 domestic customers, mainly companies in the automobile, semiconductor, and space industries, many of which process ultra-precision parts such as MEMS (microelectromechanical system) sensors. There are also processed products that only TDC can produce in the world.