In the 1920-30s, such PTUs were called schools of factory and plant apprenticeship, and later 1940s - vocational schools.
في 1920-30s ، وكانت تسمى مثل PTUs المدارس من المصنع و التلمذة الصناعية مصنع ، وبعد 1940s - المدارس المهنية .