1. Laser txiav 1. Laser txiav 2. Khoov 3. Kev tsim & riveting 4. Vuam & sib dhos 5. Kev kho deg & tiav 6. QC & Ntim 7. Kev muag khoom tom qab 8. Stamping & Sib sib zog nqus kos duab