Los ntawm AC mus rau DC, los ntawm lub zog zaus mus rau nruab nrab zaus, thiab tom qab ntawd mus rau patented thev naus laus zis (DC bus system daws teeb meem) siv rau kev tsim khoom loj ntawm sapphire factories.Cov khoom yog siv nyob rau hauv ntau yam sapphire kev loj hlob txheej txheem xws li foaming method, tshav kub exchange method thiab coj hom kev.Injet coj tus nqi thiab kev sib tw rau cov neeg siv khoom los ntawm kev tsim kho tshiab tas li, thiab yuav txuas ntxiv mus rau kev txhim kho kev lag luam.