For example, in the mass production of cutting parts that require extremely high accuracy and quality among many automobile parts such as "common rails" and "turbochargers", processing accuracy on the order of submicron is required beyond the accuracy of 1/1000. There are many products, but it is possible to stably supply products with monthly production of more than 100,000 units, which requires a lot of know-how and achievements to supply parts with stable quality.