... metal parts machining 3,Metal parts grinder machining. Precision metal parts grinder machining.Yohenjacen is a modern and ... .4,Clients drawings and samples are highly appreciated.5,We have a strong R&D center design ... it to customers to make sure it . 5,MOULD PRODUCING We will finish the mould on ... program.4,Quality,reliability and long product life.5,Mature,perfact and excellence,but simple design.6 ...