Industrial Group Act Article 49

County or city industrial associations should be organized by at least five licensed factories of the same trade that cannot join an industrial trade association. When there are only less than five factories, they should join in an industrial association of the near county or city.
中文原文 工業團體法第49條
縣(市)工業會由領有工廠登記證照而無法加入工業同業公會之工廠滿五家以上時組織之;不滿五家時,加入鄰近縣(市)工業會為會員。

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