Ko Yuhuang Electronics Dongguan Co.,Ltd, he tohunga ki te whakaoti rapanga whakapiri ritenga, i whakatūria i te tau 1998, kei te Tāone o Dongguan, te pūtake tukatuka wāhanga taputapu rongonui o te ao. Ka hangaia ngā whakapiri kia rite ki te GB, te Paerewa Amerikana (ANSI), te Paerewa Tiamana (DIN), te Paerewa Hapanihi (JIS), te Paerewa Ao (ISO). Hei tāpiri, ka hangaia ngā whakapiri ritenga kia rite ki ō hiahia. Neke atu i te 100 ngā kaimahi pūkenga o Yuhuang, tae atu ki te 10 ngā miihini ngaio me te 10 ngā kaihoko o te ao mātau. He mea nui ki a mātou te ratonga kiritaki.