... electro-hydraulic servo valve imported form Germany and imported grating ruler is adopted for the main oil cylinders on both sides ... sides of the machine body and the high -precision grating ruler mounted on the C-shaped plates , thus to avoid the ... HIWIN; Seal ring is from German FLETZ, Japanese VALQUA; Raster ruler is from German HEIDENHAIN ,Italian GIVL. (9)The type of ...