SUITOU Group has business with major construction machinery manufacturers and heavy industry manufacturers. SUITOUSHA designs, manufactures and assembles the mass-production parts such as tube assembly for construction machinery. SEC designs, manufactures and assembles the plant tube line for heavy industry manufacturers with special care in every single item. In addition, SEC is involved in mass-production products handled by SUITOUSHA, and the relationship between two companies has become stronger and the range of products that can be ordered is expanding. And further, China and Philippines factory have same production system as SUITOUSHA Japan, and possible to respond flexibly to adapt of world economy changing.