Professional Engineers Act Article 27

The provincial (municipal) professional engineer association shall be duly organized by a minimum of seven professional engineers as promoters in the provincial (municipal) administrative region. The professional engineers may join the neighboring associations if there are less than seven in number in the province (municipality) or region.The national professional engineer association shall be organized by a minimum of twenty professional engineers who practice the profession as the promoters.
中文原文 技師法第27條
省(巿)技師公會,以在該省(巿)行政區域內執行業務之技師七人以上發起組織之;不滿七人者,得加入鄰近之公會。
全國性技師公會,以執行業務之技師二十人以上發起組織之。

English translation for reference only; the Chinese text prevails. Not legal advice.