... area:Hydraulic pressure and pneumatic parts field: valve,fairlead,gear wheel and piston;Machine tol parts: sea saw,guiding ... rail,worktable and transmission gear;Metallurgy machine parts: the transporting roller for the high- ... and die-casting mould,etcCar components:gear, gear box etcWeave and printing machine parts: roller,axis,gear and flange;Train makeing fields: ...