Uses of coil springs spread in wide ranges, such as transportation including automobile and railway cars, industrial machines, precision mechanical equipment, etc. Sumihatsu covers whole production processes of design, peeling, coiling, heat treatment, and finishing, to achieve high quality of products and efficiency of production.           Sumihatsu provides wide range coil springs such as those for general use, "non-linear springs", and "high stress springs". We are developing those products which fit various specific needs of each customer.           Support, under the floor, firstly safety and comfortableness of high speed transportation.             Are manufactured by highly accurate forming and realize both comfortableness and safety during transportation.         Are made of specially formed material and react time-to-time varying loads flexibly.           (C)2003-2004 SUMIHATSU Co., Ltd All Right Reserved.