To meet the requirements of international market, our company develops TJ YAG-504C laser subsurface engraving machine that accords with the CE standard of EU. That model possesses the functions and virtues of the original models, with 8 laser heads, thin dots, green laser, it can engrave the same graphics inside 8 work pieces at the same time, which facilitates large quantities of highly accurate processes of crystal craftworks. That model makes a great improvement on laser safety precautions, and according to the CE standard and the international safety standard of low-pressure electric appliances, it adopts closed engraving method and safety interlocks to insure the operation safety and maintainers?security.