Administrative Regulations on Amateur Radios Article 12
In the case of an amateur operator being issued an amateur operator license of a higher class by the competent authority, the former license originally held will no longer be effective.
中文原文 業餘無線電管理辦法第12條
業餘無線電人員經主管機關核發較高等級之業餘無線電人員執照時，原執照失其效力。