... ODM are welcomed 3)Application:auto,toy,electronic Air Suspension Spring Features 1.Material:steel,stainless steel.brass,aluminum, ... line of investment casting introduced from Taiwan,spectrum analyzer device imported from Germany,vacuum melting furnace,CNC machine ... 8Test Euipmentspectrum analyzer, Physio-chemicalLabora tory 9Production lines1) The lost-wax casting of stainless steel and heat-resisting ...